Th350 dual feed direct drum All other positions should have a Torrington bearing. Jul 8, 2004 · TH-400 alum forward drum 2. 95. Does anyone know of a manual or step by step instructions on how to internally dual feed the direct drum in a th400? Something about Install the wide bushing in the direct drum and check the fit of the sealing rings in their grooves on the stator shaft. Hughes Performance TH350 Direct Drum & Custom Sprag Assembly / Race Assembly. I'm confident I have the seals on the piston correctly,both the inner and outer lip seals facing down and he lip seal on the drum facing facing up I'm assuming this is the correct way. Mar 28, 2016 · Ditch the B&M kit cross over plate, to much potential for the crossover plate to leak. Explanation of the dual feed Oct 10, 2017 · At any rate the direct drum was a late model with single feed holes, had a . Taught me something, that old direct clutch gets lots of volume and pressure, wear comes from pack going back on top of 1st gear due to lack of spring tension and vent hole. Use a stock seperator plate and valve body with all 4 ballchecks Aug 5, 2008 · I drill the 2nd feed to . This is why we also double up the bushings on the sun gear in the TH350. This allows reverse when applied simultaneously with the direct (high gear) clutches, and allows manual low gear when applied with the forward clutches. Rpms about 4,000 with pedal to the floor. Full content visible, double tap to read brief content. Check for Sealing Ring wear on the Direct Drum (Arrow) Check for the Intermediate Sprag Race is not cracked (Red Arrow), The Sprag will Overrun (Turn) freely Counter Clockwise, And Hold "Lock" Clockwise. I dont believe for your application you need the HD steel direct drum. $701. This is done on a machinist or brake lathe. all i was going to do was replace the bushings , seals , steels and frictions. TH350 Drum 36 Element Sprag 350-327900; More Views. Direct clutches start to slip at Feb 25, 2017 · With no experience building, and if getting someone else who is really familiar with the trans to build it is out of the question, I would suggest you buy a shift kit. You definitely want to use the hardened outer race either way. I've had the TH350's into the low 10's with this setup and zero issues. Feb 1, 2006 · It may be necessary to machine the direct clutch piston to install 5 friction plates. Part Number: 512-HP3279. Direct piston machined for extra friction and steel (found a source for one ready to go I think. 70 lbs TH-350 OEM direct drum bare 7. Jan 17, 2025 · Retrieved from "https://www. Prevents broken case and drum due to excessive pressure. clean fluid. 7" approx diameter and the drum gets "cocked" because of the sun shell putting pressure on the outside of the drum. Jul 29, 2008 · The reason for the direct drum bushing wear is the way the direct drum drives the sun shell. This is a patented design so is unique to the TG kit. TH350 no reverse when hot - fresh rebuild all new clutches, steels, bushings. Turbo spooling up. i just cant remember if i used the better clutch drum , guess May 9, 2007 · We leave the center seal out of the direct drum, when we dual feed the high clutchs [ makes for a firmer 2-3 ]. 5 posts • Page 1 of 1. A WEBSITE crankshaftcoalition. I usually leave it off 400's but just not as sure on th350's. You are correct that the outer race is the same, but the inner race is not just a ground down original roller ramp race, it is an entirely new custom piece press fitted to a stock drum core and then pinned to securely prevent rotation. 99 In Stock: Jan 11, 2006 · It will dual feed the direct clutches for longer clutch life, it retains all engine braking features, and it will give you throttle modulated shifts and retains the modulator. Th350 pump bearing can use on TH400 at the back. Mar 12, 2022 · A moderate , light , slow shift on 2-3 is common on stock or light modified T-350. hole, directs were green waffle, slippery looking steels but no hot spots. Log in. It also doesn't result in a reverse delay on those applications Some have issue with the 200-4R dual feed because they do not have a complete Nov 1, 2005 · Dual feeding is a proven method to almost double direct holding capacity as it is used on almost ALL TH350 VB kits, TransGo's Th400 kit, and is also a requirement on transbraked applications. It doesn't require any real calibration changes on the TH400 or TH350, it does on a 200-4R. It reduces the tendecy of the sun shell to get cocked and helps May 17, 2012 · when i built a TH350 for performance use. It is accomplished by most valve body kits without doing so internally but requires a "transfer" plate and gasket to be added under the support plate in front of the valve body. TCI 327900 - Transmission Drum & Sprag Kit GM TH350 (2) $548. Mar 16, 2009 · Yes, I have instructions and have drilled an 0. This kit Feb 2, 2006 · Jump to Latest 1K views 3 replies 2 participants last post by Phil68chevelle Nov 12, 2006 general motors turbo hydramatic 350,TH350,turbo 350, help you build,turbo350,thm350 The dual-fit or clip for direct-drum springs; Sep 13, 2006 · TCI 327900 TH350 36-Element Sprag and Drum Assembly Brief content visible, double tap to read full content. Oct 22, 2014 · more info, done this same thing on original pump to new fti high flow, and modified to full manual original vb to fti full manual so can rule them out, and I did not drill a bleed hole but do have the direct drum piston lip seal removed for dual feeding with that seal being the only mod for the dual feeding, 5 clutch direct drum and 4 clutch intermediate Feb 2, 2016 · TH350 TH350C 350 350C Center Support Case Saver Assembly Wide Sprag Update 69 On | eBay I rebuilt transmissions for 9 years. The intermediate sprag is the weakest single component in a TH400 and TH350. Aug 3, 2023 · Dual-feed the direct clutch via the case for all high performance applications - see my TH350 build-up on a budget video or TH350 Rebuild PT1 below for instructions covering this procedure Fluid - Use Dex III except perhaps in street/strip or full race where Type F may be more advantageous given it provides for a bit firmer shifts, all other I installed the Dual-Feed Direct-Drum plate; I installed the gold B&M Separator Plate (blocks 2-3 accumulator) Against the instructions: I kept all check balls; I retained 1-2 accumulator operation; I drilled the 2nd feed and 3rd feed holes 0. Can you dual-feed the direct clutch in a th350c? I seem to recall hearing that the converter wont lock when you dual-feed. Dec 8, 2000 · I will cover intermeidate cluitch installation, direct drum assembly, forward drum assembly, pump inspection and assembly, air checks, dual feeding modifications, 34 element intermediate sprag vs. Product Q&A View Now. 070 4l80 intermediate clutches + steels . 750 HP/TQ capable. Aug 3, 2023 · Billet Forward Drum: Recommended for applications in excess of 800 HP/6000 RPMs to reduce likelihood of structural failure in OEM drum under extreme RPMs or high horsepower applications. You can remove second ring or lip seal or both. Dual feed the direct clutch by removing the middle ring from the stator support and installing a plug in the pump face of the case in the reverse circuit. In this second video on building a new transmission for DaddyJeep we start assembly and doing a few mods. You asked for it and you got it. May 3, 2016 · The engine is a garden variety SBC, small cam, single 4 bbl, headers. any ideas? Apr 22, 2018 · Dual feed is when you feed one drum from two ports on a 3 lip seal drum. WTF its in a light car. . Blue box TransGo kit Dec 25, 2009 · A TH350 is a pretty stout trans with some minor mods. 125″ (not 0. May 20, 2010 · Dual feed a th350 Jump to Latest 3. Forward gears 1,2 and 3 are good. The auto shift valve body would have to either route the fluid to take care of that or with an OEM style valve body a shift kit would need to be added. So 3rd gear will be the first gear to fail in a TH350, usually causing reverse to quit working also. Use a stock seperator plate and valve body with all 4 ballchecks About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright Feb 14, 2002 · Best way to dual feed is block the reverse feed hole in the case below the pump and leave out the center seal on the drum and pump cover. 188″. 050 clearance Jun 15, 2011 · Im doing the dual feed tech, left out the center seal on the pump stator shaft, but I forgot to remove the direct drum lip seal that keeps pressure from being equal on both pump lip seals. Should I even bother with the 36 element drum or step up to a completly different and stronger trans? Current trans is dual fed and 5th direct but had stock sprag with hardened outer race. Note: The direct clutch drum has two separate oil charge cir-cuits: one for 3rd/4th gear, and both for reverse oil charge. My buddy did his burnout. Apr 10, 2002 · TransGo kits dual feed a Th350 and 400, and every shift kit I have used dual feeds a Th350 Once you get to the point powerwise that you need to dual feed, you woudl also need to install the good forward drum from CK performance or PTS. The factory bushing is kinda narrow, a wide bushing helps keep the drum spinning on center. Get a simple kit like a TCI transcat or B&M transpak. I cover the intermediate clutch in more detail, including the differences in apply piston design over the years and variations (V6 vs V8) as well as show you 4L80E Reprogramming Kit, HP HD Automatic w/ Complete Gear Control (91-Up) Ends direct clutch burnup-Dual feed Direct Clutch, Holds BIG Horsepower. Add Sonnax boost valve. 125" and 3rd . I normally tap it for a 3/8 bolt and then use a cut and slotted 3/8 bolt. com/wiki/index. This allows the outer race to rotate freely in one direction, and then lock in the other direction. Nov 21, 2020󰞋󱟠 󰟝 Dual feed process of TH400 and 4L80E. Direct Drum - Internal Dual Feed: More than doubles appy surface area for increased holding power in 3rd gear for higher power street strip or racing applications Jun 12, 2013 · I performed the mods I always do in these things including removing the center seal from the low reverse piston, removing the center seal from the direct drum, I removed the sealing ring off the pump stator to make the dual feed mod, and I drilled the . Once you dual feed the direct clutches (you did so by removing the drum seal and plugging the reverse feed) there isn't anything else to easily fail except the sprag. 750 wide if i remember correctly. 7K views 3 replies 4 participants last post by Brian Esser Oct 23, 2012 Jun 18, 2007 · Failed intermediate sprag, damaging the direct drum in the process. May 17, 2021 · Th350 rebuild help. here's what was done. Upgraded 10/07 includes triple layer separator plate. Block the 3rd acc hole bore under the 2/3 acc piston with 3/8 cup plug. AMC Jeep. Remove direct clutch piston inner and outer seals. Nov 21, 2020 · Dual feed process of TH400 and 4L80E. all dual feed the direct drum on a TH350 but only (as far as I know) TransGo does it on the Th400. 81 lbs Jul 6, 2006 · My next thought is that maybe you have some type of dual feed of the directs that is backfeeding low gear. 060 bleed in the direct drum. A TransGo shift kit with proper separator plate will dual feed the direct clutch for better 2-3 shift. Sep 17, 2021 · I appreciate that I just put a spring behind there that fit as no one seemed to carry it. 140". Just make sure you don’t bottom out the bushing on the step inside the drum. im thinking thats what save this dieing trans that came with the truck. The problem is I can't get 5-clutch Direct Drum and 34- element Sprag for GM TH-400 and 4L80E Transmission. 147. Ready. I also drilled the separator plate feed holes out to 1/8" to increase line pressure, doubled up the bushings in the sun gear and re-drilled the oiler hole, set up internal dual-feed on the directs, used the hardened intermediate sprag race and hardened input shaft, and used the Jan 12, 2021 · Crap, I forgot to mention a wide direct drum bushing (assuming your bushing kit doesn’t come with it). Sep 24, 2009 · Thanks yall for all of the help. This trans is an 88 truck trans. Do an internal dual feed instead. correct level. Dec 26, 2012 · I would like to dual feed my th350, correct me if I am wrong on how to do so: Remove the center seal off of the direct drum, THEN plug the one hole in the case on the front pump surface, LASTLY remove the 1 ring off of the front pump itself. Sep 4, 2004 · Weaknesses inherent to a stock TH350 are the intermediate sprag, direct clutch apply area, sun gear and direct drum bushings Really about all I can think of. Jan 20, 2024 · Direct Clutch dual-feed procedure: Direct clutch, center support and case: Leave center seal off direct drum; Leave 2nd from top sealing ring off center support stator; Plug high-reverse feed port in case using ⅜” cup plug OR weld the high-reverse feed orifice in the separator plate (you can do both but it’s typically not necessary) Dec 8, 2011 · Th-400 Intermediate Band I HAVE SEEN SEVERAL SITES WHICH HAVE DESCRIBED THE DUAL FEED MODIFICATION, TAKING SPRING OUT OF 2-3 ACCUMULATOR, DRILLING THE FEEDS IN (1-2) (2-3) FEEDS IN VALVE BODY, AND GRINDING THE FLATS ON THE (1-2) VALVE. Hope this is helpful to all Jan 4, 2006 · They don't need much, hardened sprag race, dual feed the directs, bump the pressure regulator spring up, double up the sun gear bushings, use a wide direct drum bushing (should do that on ANY Th350 build), install 5 direct clutches, tighten the endplay, make sure the pump body surfaces are flat to prevent crossleaks, use Teflon sealing rings Aug 7, 2013 · I only used 1 check ball during my TH350 rebuild, makes for harder shifts. Nov 22, 2021 · Output! Reaction Carrier! Direct Drum! Forward Hub!Also internally dual-feed the Direct piston, add a sixth Direct clutch, some valve body changes, including Nov 30, 2010 · My th350 rebuild has been going smoothly but I have couple of questions. I have the same k20 you do pretty much. There is no mention of removing the seal on the drum in the instructions for the trans brake. The TH350 can be made compatible with a variety of AMC I6 & V8 engines. i did the following new thrust washers changed all the bushings w/ 2 extra sun gear bushings machined the piston for 5 clutches dual feed using a good shift kit hardend intermediate race with new roller clutch use a deep pan with a good oil cooler "very important" TH350 CLUTCH DRUM - DIRECT, HD 36 ELEMENT SPRAG FOR HIGH HP: 355682: $449. com DESCRIBED THESE Nov 14, 2023 · Forward Drum: Machine the forward clutch hub for the 3-piece bearing that goes under the center support: There’s a roughly . Ok so far. Dec 20, 2013 · remove the seal in the drum. The direct and forward drums pistons didnt have wavy or flat steels on them, they have this steel where the inside is pitched inward, like if you sliced the top 1/4" off a funnel. " Can someone elaborate this, preferably with pictures. 0625 at a 45* angle in the direct drum. Jakeshoe said this in a previous thread: "Leave the lip seal off the inside of the direct drum. Build video TH350 Transmission video 1-2. B&M shift kit. 9—Reverse feed (direct clutch drum); slows oil feed to the reverse/direct clutch to con-trol apply feel; also allows faster exhaust of the reverse/ direct clutch during release; not 100% required. Remove and discard direct clutch piston center seal (middle size seal). Transmission to Rear-end. Re-drilling the separator plate's 2nd and 3rd gear feed ports to 1/8" will increase line pressure just enough, not too much. Of course dual feed it, 5 clutch direct, bleed hole in direct, spiral lock, and annealed outer race. Aug 7, 2018 · Direct drum dual feed 34 element sprag/drum - likely. Question number one, is there any issue with leaving the center seal out of the direct drum, and removing the sealing ring from the pump when using the spacer plate/transfer plate? Dec 19, 2003 · You also would want to dual feed trans fluid to the direct clutch drum. When i took it apart it aPpeared to be all stockexcept a tci manual valve body. 095 dia. First is I'm having a problem fitting the direct drum piston. Feb 14, 2009 · On the direct drum is one checkball and one small hole side the drum. 06 lbs TH-400 alum direct drum 3. It has been previously been rebuilt with a TransGo shift kit. Possibly a bad center seal in the direct drum or sealing ring on the stator. Note that there are dual-pattern “uni-cases” compatible with both the Chevy and BOP style engine blocks. Any kit that blocks the modulator will cause abrupt shifts at all throttle positions. Aug 17, 2003 · B&M, Hurst, TCI, etc. Mar 25, 2018 · Like Matt said, dual feed the direct clutch, rollerize the rear case and I also recommend installing 4L80E once piece teflon sealing rings onto the pump stator as well as the center support (leave the second ring from the top off to facilitate the direct clutch dual feed. So I will remove the seal in the drum. If the drum is worn in this area, it is best to get another May 27, 2017 · He has decided to replace it with a 400, but wants this fixed to be used as a backup for another car. i have a question for the Trans go kit users? Dual Feed direct drum. php?title=TH350_rebuild_tech&oldid=3488495" The first item to go in the case will be the low/reverse apply piston. Mar 7, 2005 · im in the same delima , i have a running th350 in my car now with the hd sprag and roller bering , it works fine ive had the trans together for 6 years with no problems except a mis aligned front pump seal , numerous nitrous passes and street miles . It should be smooth with no grooves, pitting, or wear present. When I rebuilt the direct drum I found out was missing the inner lip seal on the drum. When I rebuilt mine (TH350 also) I used the HD low reverse sprag center support listed above. A given. **NOTE, Do not mix the Sprag Races on these 3 drums!!!! The 4L80E Race is taller for the 4 Intermediate Clutches vs 3 on a TH400 & will not fit on a TH400 Direct Drum. Bushings should be replaced always, as they are under high loads and if worn out, they will bleed of. 67 lbs TH-350 OEM direct w/36-element 10. If it's in the budget, there should be no thrust washers except for the forward drum to front planet ring gear. Will the 36 hold up to Apr 4, 2010 · I've read the th400 thread here multiple times and I think I get the jist of dual feeding a th400 but before I do it I want to be 100% sure of what I'm doing. TSR Racing Products, TH350 Direct Drum with 36 Element Sprag: Item Number: TSR350-327900 Be the first to review this item: Unit Price: $365. I block the 2-3 accumulator and dril the feed for 3rd to . Piston have not any checkball. More build video’s coming it just takes a lot of time. [ in the plate ] Aug 22, 2013 · TH350 pump torrington for rear thrust Center support reverse feed plugged (dual feed) 2nd sealing ring from front removed on center support 34 element sprag (already have smooth drum, early tranny) (4) . Stage. 84 lbs TH-400 OEM direct drum 8. 48 lbs TH-350 OEM forward drum w/input 8. STEP 7 Direct Clutch Drum Modification: It is best to drill the bleed off hole in the drum from Jun 30, 2014 · But with heavy car with 4wd and big block, i would put a HD intermediate sprag outer race and a extra friction to direct clutch. Do not buy a transgo kit their dual feed plate is a joke. Also I omit the drum seal with these kits. I suspect this is a control problem [valve body ] And if you do take the valve body off to check, you may as well drill the 2-3 feed out to about . 3rd is dual feed through the case with a passage plugged in the case as well as a sealing ring left of the direct clutch in the drum that separates low and 3rd. crankshaftcoalition. Jul 18, 2011 · Title says it all. pulled center seal in direct drum for dual feed. Our Stage 2 TH400 includes all the components in the Stage 1 rebuild but is upgraded to a 34 element sprag and the corresponding direct drum, 6 clutch direct with carbon based frictions, 4 clutch intermediate, manual/automatic valve body or forward pattern full manual upon request. Dual feed the direct clutches, enlarge the feed holes, and block the 2-3 accumulator. Aluminum Deep pan and additional modifications. Would leaving this in and not having the center pump seal cause the air leak im experiencing?? Nov 1, 2005 · Dual feeding is a proven method to almost double direct holding capacity as it is used on almost ALL TH350 VB kits, TransGo's Th400 kit, and is also a requirement on transbraked applications. 140″) Feb 8, 2016 · Sit the Forward/Direct Drum with the Input Shaft facing UP, Lift the Direct Drum off the Forward Drum. 97 lbs TH-350 alum direct drum bare 3. A WOT 2-3 shift with the stock forward drum and dual fed directs can break the forward drum. D direct drum and 36 element sprag. I also have a few other small questions, but l want to focus on this one first. Dual feeding doubles the area of the piston that has pressurized fluid on it in 3rd gear, more than doubling the capacity of the clutch. The 2004R, 400, 350, and 4L80 all use the direct drum with 2 chambers. 50: 400-PRO: 34171 Jan 4, 2018 · Direct drum dual feed 34 element sprag/drum - likely. This mod works on TH400's, TH350's, 200-4R's, and others. 00: T350 Billet Aluminum Pistons Replace your 40 year old T350 cast pistons with an all-new Apr 19, 2013 · I rebuilt a friend th350 today. Transgo kit - likely, we'll see. May 3, 2009 · I drill the 2nd feed to . not on the piston. 16 lbs TH-350 alum forward drum w/input 4. Nov 4, 2004 · The one that all transbrake (TH400 and TH350) setups use, and I use on TH350's is to leave the center seal off the direct apply piston, sometimes a ring off the center support (TH400) or stator (TH350), and plug a passage in the seperator plate or transmission case. Any truth in that? This trans is going in my dads 81 GMC truck 4X4 ( was deisel powered,now has a 455 Olds!) I dont want to have to remove the trans and transfer case later to install the center seal if this mod wont work. A sprag clutch simply uses a series of dog-bone–shaped components that are held stationary between a smooth inner and outer race. Tree starts counting. We recommend using high performance clutches in all builds, and in cars above 550 horsepower, upgrading the direct drum is also recommended. Other kits would be below par in my book because for a hi-per tranny this is a MUST. red pressure spring and all the other trans go kit stuff. Dec 23, 2018 · wide direct drum bushing,, double up on the sun gear bushings. It also doesn't result in a reverse delay on those applications Some have issue with the 200-4R dual feed because they do not have a complete Jul 12, 2007 · You are borderline on where I use the 36 element sprag and drum setup. The car is a '60s or '70s gasser that has been licensed and made into a street car (barely). Dec 27, 2015 · I also made mine internal dual-feed on the direct piston, supposed to double the clamping force of the directs. How does that sound so far? My last 400 I just went to a big trans shop parts counter, and said I was looking to do a clutches/steels/seals on my th400. Gregaust you said must be dual feed the direct. 10 inch converter. Thats the inner seal that's removed from the direct drum piston? I read the wiki but he just says the seal seperating the two halfs. Their instructions do not show any modifications to the case or omission/removal of any internal seals. Have to modificaton the case or will i take a way original back washer and put bearing These differences only affect the front bell of the case, and all TH350 cases are similar from that point back. remove the 2nd from the bottom (towards the thrust surface) sealing ring on pump and block the feed in the case that is next to the 4:30 position pump bolt location. Dual feed. Where you get in trouble is when you leave the center ring or lip seal out and send oil pressure somewhere it doesn't belong. ) Drill 2nd feed to . Lock the trans. Step 6: Inspect the inside of the direct drum bore for wear at the spot where the sealing rings ride. Noaht4 New Member Posts: 2 Joined: Mon May 17, 2021 1:33 am Location: Pei. 11 lbs TH-350 alum direct w/36-element 5. Jul 18, 2007 · The plug keeps the direct circuit from backfeeding into the reverse circuit when it goes to high gear. All of the trans can be dual fed using basically the same methods. There is even greater load in reverse because of the gear multiplication effect. Click image to zoom. new clutchs and seals. 99 Oct 30, 2013 · Removing second ring, plugging the reverse feed hole - the one at the right, and removing the inner lip seal. Most importantly, almost all of them dual feed the direct drum piston to increase apply area to 3rd gear. You don't need fancy clutches, I would machine the direct apply piston for 5 frictions, use stock Borg Warner friction clutches, stock steels, dual feed the clutches internally, double up the sun gear bushings, drill the feed holes in the seperator plate and Jul 31, 2022 · Here's a few homebrew tricks you can do to improve longevity and performance in your GM Turbo 350. You can still dual feed it. Jan 21, 2007 · There is quite a bit of load in 3rd gear on the 3rd clutches because of the lack of gear reduction (direct drum). still a slug in high gear. Custom 36 Element Drums are available, Not needed on most anything street driven. Dec 29, 2015 · If you have a Late TH400 (Direct Drum), Buy a Early Drum or a 4L80E Drum. If I were doing this again, I would drill 3rd feed to 0. Feb 9, 2015 · th350, running it 9 years and has always had a lazy 2-3 shift. Two more questions. 0625 to eliminate centrifugal apply even when not using a manual valve body? Trans in question has a TCI transcat shift kit and the owner wants to keep an automatic shift. I know the dual feed direct clutch modification can seem i Jul 28, 2020 · You stage with Direct, Low, and Reverse all engaged. stock 16 element and later roller clutch as well as various assembly tips to improve the TH400. Properly done, 700 RWHP/TQ for seasons at a time in a wheels up car. When you let go of the button, reverse lets go, and you get a surge forward for a great launch in low gear. 065 clearance (5) red alto clutches and plain steels, . No special clutches are needed, the TH350 has a more than adequate clutch surface area and apply area (when dual fed). I also plugged the feed to the 2nd accumulator. I have a trans go th350 1&2 kit already with the dual feed set up for the direct drum. In your case, If you left the Center lip seal out of the low/reverse piston, or cut it, You will feed your direct clutches, binding up your trans BTE offers a variety of upgrades for stock TH350 transmissions. Hopefully he left the correct one in lol. May 17, 2021 · Noaht4 wrote: ↑ Mon May 17, 2021 9:51 pm So I’m im trying to rebuild a th350 and I’m new to transmission rebuilding, I wanted to beef it up so I put a ck performance direct drum with mechanical diode, a ck input shaft with forward drum , a ck extreme duty low roller clutch, a trans go shift kit, and i was using alto red clutch’s. See the parts section below for our Turbo 350 performance components. When I dual feed a TH400 or TH350, I disable the 2-3 accumulator. TransGo does it with the sandwiched seperator plate. A shift kit does several things to improve the trans. The stock TH350 direct drum and sprag assembly uses a roller-type clutch as shown. 125"-. The later 700 low support is a good upgrade for a 4x4 application, dual feeding the direct clutches is mandatory. Dec 11, 2010 · The 36 element TH-350 sprag is a custom piece, made for the people converting the drum. Moderator: Team. Its function is for oil to force it towards the front or bell housing side of the trans, applying the low/reverse clutches. He shifts at 6800 and burns the directs over time. 030” thickness between the bearing assembly and forward hub’s thrust washer: Direct Clutch dual-feed procedure: Direct clutch, center support and case: Leave center seal off direct drum Jun 6, 2023 · It provides a "dual feed" to the direct drum. 040-. This is desirable to increase the third-gear apply-piston clamping force for increased torque capacity. Now that the drum assembly is completely disassembled, a bleed off hole must be drilled into the direct clutch drum. See our Kit #437AMC for details. Mar 3, 2020 · Omit the seal in the direct drum, omit the 2nd sealing ring from the center support, drill the stock spacer plate as per the TransGo or B&M instructions, and you have the same benefit. Easy Installation! $162. Tell us more about the trans, what mods, etc. 125" and retain the checkballs on an auto valve body build. I am certainly no expert on transmissions Check out Dec 11, 2014 · Is there any harm in drilling a bleed in the direct drum say . It may be necessary to machine the direct clutch piston to install 5 friction plates. TH-350 direct drum heat treated outer race 36 element sprag wide bushing and spiral lock. Aug 23, 2014 · Shook the tires last night and lost 2nd and third gear after trying to pedal it. What does it mean? Sorry i don't unterstand english so well. 0. Mar 25, 2012 · H. Video 󱡘 Jake's Performance. You should also make sure that the wider bushing is used on direct drum. The hole I was refering to was one in the case, I think it is next to the center support bolt hole. I like 4 clutches in the intermediate Nov 25, 2010 · Drilling the two holes (within reason) is how you should make crisper shifts on a TH350. Bushings - TH400 doesn't eat bushings like a 350, but will do as needed. All work performed with pan off, trans stays in the car. Is there a write up on the dual feed modification? All I can find online is pull the inner seal from the direct drum and not the two on the piston, and to block the reverse port in the front where the pump is along with leaving the second ring out. Should i leave it off or install it. jyyzza ecs whzrh ghkyhe lafsgwg umdum zaoc xebwc rmgdqnzl acwrd aksz rws jwtsplhzp hnyyz tcrvlu