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Discussion Starter #1
Well I have to rebuild my th400 before this season for sure, was hoping to get through a year before building it but that won't happen so might as well do her up a bit:grinpimp: I want it to handle what I do and last, but without breaking the bank:homer:

Going in chevy k20 with healthy bbc(400+hp):D and a divorced 205 case, tons,tci saturday night special stall for the th400 , 44 boggers ,etc..

Called Rossler transmission and they are booked for 8 weeks so I am going to the local mister transmission:rolleyes: Just hoping to get kinda a list together of what I should make sure to tell them, or parts to use, etc.

I want to have P,R,N,1,2,3 shift pattern instead of the old P,R,N,3,2,1 and I will not be using the kickdown and will always manually shift it. So I think a TCI reverse manual valve body should go in there? Oh yeah and they have 2 of them I see on summit, one with engine breaking, I assume I want that one? (i like my gears slowing me down)

Should I ask for a high flow pump?

Mister T guy said they will use extra clutches and can do a few other things but wasnt very specific... So I wanna know what I am talking about for when I bring the trans over and talk to him about what I want tomorrow.

Thanks
Phil
 

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Wow, another TH400 rebuild thread. Between Gen. 4X4 and the Chevy forum this comes up three or four times a week.
 

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Discussion Starter #3
Wow, another TH400 rebuild thread. Between Gen. 4X4 and the Chevy forum this comes up three or four times a week.
Easy there newb, obv I have been watching and done searching but couldnt find the same secario's, thus posting my questions.

If you know of threads out there that would help me pls post them then:flipoff2:
 

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Discussion Starter #6
Ok so tci rev man vavle body and 34 element sprag are on order for sure! Anything alse that better go in there?
 

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Ok so tci rev man vavle body and 34 element sprag are on order for sure! Anything alse that better go in there?
Kevlar clutches with new steels... Made by Raybestos... If I recall when I worked at Mr Transmission so many years ago there was also a "Police Upgrade" kit for both the th350 and the th400 that came with kevlar clutches and new steels that were made to put more numbers into the clutch packs with the steels being a bit thinner to accomodate them...
Also and upgrade for the planetaries as well...
Now that was 20 years ago when I worked in a transmission shop but there is a company called AutoStan that used to supply parts to the location I worked at and at the time they were very helpful in purchasing the transmission parts that anyone needed.

AutoStan
Address: 24 Haas Road, Toronto
Phone: (416) 745-1151

Kelly
 

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Discussion Starter #9 (Edited)
Kevlar clutches with new steels... Made by Raybestos... If I recall when I worked at Mr Transmission so many years ago there was also a "Police Upgrade" kit for both the th350 and the th400 that came with kevlar clutches and new steels that were made to put more numbers into the clutch packs with the steels being a bit thinner to accomodate them...
Also and upgrade for the planetaries as well...
Now that was 20 years ago when I worked in a transmission shop but there is a company called AutoStan that used to supply parts to the location I worked at and at the time they were very helpful in purchasing the transmission parts that anyone needed.

AutoStan
Address: 24 Haas Road, Toronto
Phone: (416) 745-1151

Kelly
Thanks Kelly, If the mister t in pete has any problem locating parts I know where to get them now! thanks, and I will look into the police upgrade!

RMVB, 34 element sprag and good clutches will do it. Use enough cooler and a decent converter.
Right on, I have a pretty big cooler with a tauras fan in the bed:grinpimp: and a new tci tc as well so at least I dont have to buy them still!
Is a deep trans pan and filter extension worth while for the money if I have that cooler set up already?
 

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Discussion Starter #11

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What year is your trans? What was it out of? I start with 1982+ motorhome or CUCV/K30 cores, they have some factory HD parts to start with.
 

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What year is your trans? What was it out of? I start with 1982+ motorhome or CUCV/K30 cores, they have some factory HD parts to start with.
How can you tell looking at a TH400 what it's out of? I have two or three 4wds that I have no idea what they're from and then I have another one that is a 2wd with a fixed yolk on it.
 

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Discussion Starter #14
Corey, This is the trans out of a 2wd suburban where I got my 454, I think it was a 81 3/4 ton so I probably dont have the HD case. Mine is bolt on 1350 yoke. However there is a crack forming off a govenor cover bolt towards the tailstock so I will be in the market for a core.

This is great info to know, Hopefully I have luck finding one of those cores!
 

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How can you tell looking at a TH400 what it's out of? I have two or three 4wds that I have no idea what they're from and then I have another one that is a 2wd with a fixed yolk on it.
There is an ID tag riveted to the side of the trans with a date stamp and some other info. The bellhousing and tailshaft castings are different, and there are a bunch of different output shafts, pump bolt patterns, metric or SAE bolt cases, etc... I am not a trans builder but I run TH400s and am always trying to find the best factory one to start with. The best core case has a cable operated drum parking brake on the back of it ;)

A few other upgrades are longer block dowls, the factory ones are short and sometimes the two allignment holes in the bellhousing get worn out. The plastic breather can be replaced with a newer GM metal one so you can attach a rubber vent line, water will kill the clutches pretty fast. There are two roung metal lugs/dowls in the side of the case, make sure they are not backing out, some guys TIG weld the lugs in just to be safe. When you have the case all disassembled, look for cracks, there are at least 6 different places I have found hairline cracks on "good" working TH400s. Motorhome TH400s have bigger cooler line fittings, I think they are 3/8 and most other vehicles are 5/16" diameter. Most HD trucks and motorhomes have factory deep pans and filter extensions. A sheetmetal pan will take a hit from a broken driveline or rock and deform, when a cast aluminum pan will crack and leak.
 

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Discussion Starter #16
There is an ID tag riveted to the side of the trans with a date stamp and some other info. The bellhousing and tailshaft castings are different, and there are a bunch of different output shafts, pump bolt patterns, metric or SAE bolt cases, etc... I am not a trans builder but I run TH400s and am always trying to find the best factory one to start with. The best core case has a cable operated drum parking brake on the back of it ;)

A few other upgrades are longer block dowls, the factory ones are short and sometimes the two allignment holes in the bellhousing get worn out. The plastic breather can be replaced with a newer GM metal one so you can attach a rubber vent line, water will kill the clutches pretty fast. There are two roung metal lugs/dowls in the side of the case, make sure they are not backing out, some guys TIG weld the lugs in just to be safe. When you have the case all disassembled, look for cracks, there are at least 6 different places I have found hairline cracks on "good" working TH400s. Motorhome TH400s have bigger cooler line fittings, I think they are 3/8 and most other vehicles are 5/16" diameter. Most HD trucks and motorhomes have factory deep pans and filter extensions. A sheetmetal pan will take a hit from a broken driveline or rock and deform, when a cast aluminum pan will crack and leak.
Great tips corey, thanks

I will have a barbed fitting in the breather to my Canton breather/overflow tank:smokin:

Was looking at cast aluminum pans till now, I will get a stamped steel one:grinpimp:


What are those plug things in the side of teh case for?
 

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If you are going to run an aluminum pan, the B&Ms have a thicker flange then almost all the other ones, just put a skid plate on it.

Here is some good reading, there is a ton of info about TH400s on the web, just search around:
http://www.hotrodders.com/forum/t-400-build-tips-photos-145318.html

http://www.700r4l60e.com/store/catalog/TH400-Heavy-Duty-Transmission-Chevrolet-p-195.html

These things im pointing to with the stick, I think they are the rear band lugs, make sure they are not working out
 

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Gravity Works!
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If you are going to run an aluminum pan, the B&Ms have a thicker flange then almost all the other ones, just put a skid plate on it.

Here is some good reading, there is a ton of info about TH400s on the web, just search around:
http://www.hotrodders.com/forum/t-400-build-tips-photos-145318.html

http://www.700r4l60e.com/store/catalog/TH400-Heavy-Duty-Transmission-Chevrolet-p-195.html

These things im pointing to with the stick, I think they are the rear band lugs, make sure they are not working out
What year is that TH400 from? Was that and old 60 vintage divorced 4x4?

Why is the 1965 (I believe thats the year) so different?

Thanks for the info too.
 

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Hughes performance. Done. Latest 400 started with a tci rmvb w/ engine braking. didn't make it to the trail. 2nd gear started slipping from a dozen full throttle street runs on 42's chirping tires shifting to 2nd. Hughes now is making there own rmvb in house. Call and talk to Tony or Bill and tell em Big Chuck from Flynhi sent ya.:smokin:
 
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