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Old 06-22-2018, 07:18 PM
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T-475 Tail housing

Hello
I've read a lot of posts regarding this situation i have, but couldn't find a definitive answer that fully solves what i need to do.

So i have a TH475 transmission, that i want to marry with a l31 engine, but at the end of the transmission instead of having 6 holes like the th400, this has 4 and has a square frame, while the th400 is round.

My question is, what kind of adapters/parts do i need to buy to make this th475 work or to be complete.

I'll appreciate any help i an get.
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Old 06-22-2018, 07:58 PM
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That flange is for the driveshaft emergency brake used on medium duty trucks. If you look forward of that, you see the normal six bolt pattern. Unbolt this tailhousing and bolt on a normal 6" housing.

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Old 06-22-2018, 08:05 PM
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Quote:
Originally Posted by joe_padavano View Post
That flange is for the driveshaft emergency brake used on medium duty trucks. If you look forward of that, you see the normal six bolt pattern. Unbolt this tailhousing and bolt on a normal 6" housing.

Hi Joe
thanks fo your input, yeah i removed that ebrake, this trans was pulled from a gm mobile home, so if i unbolt the flat 4 holed base, in theory i will be left with a th400 right?

from there i should just bolt on the 6" housing like you said?
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Old 06-22-2018, 08:36 PM
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The six hole bolt pattern at the forward end of that tailhousing is the same as on every TH400 case. It will look like this.



The output shaft is a short one - second one from the left in the top row. You can ignore the threaded hole in the end of the output shaft. A normal car short output shaft is the first on the left in the top row.



Just get one of these. Don't make this harder than it needs to be. Six bolts and you have a "normal" TH400.

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Old 06-23-2018, 07:32 AM
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There's a seal already there, wouldn't a standard yoke fit what he has now?

Russ
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Old 06-23-2018, 08:54 AM
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Quote:
Originally Posted by S10xGN View Post
There's a seal already there, wouldn't a standard yoke fit what he has now?

Russ
No... there are roller bearings in that motorhome tail housing. Requires the proper diameter yoke that is used on the drum brake setup.

The slip yoke is differrent diameter
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Old 06-23-2018, 03:23 PM
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Quote:
Originally Posted by joe_padavano View Post
The six hole bolt pattern at the forward end of that tailhousing is the same as on every TH400 case. It will look like this.



The output shaft is a short one - second one from the left in the top row. You can ignore the threaded hole in the end of the output shaft. A normal car short output shaft is the first on the left in the top row.



Just get one of these. Don't make this harder than it needs to be. Six bolts and you have a "normal" TH400.

Thank you so much for the info Joe
do you have a part number for that adapter?
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Old 06-23-2018, 04:09 PM
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Remember the output or tail shaft is the first thing to go in the case and the last thing to come out.. I had to do the same exact thing to my cad t-400 to remove the long tailshaft and install the short shaft. While I was in there I installed new clutches and freshend the trans..

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