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-   -   output shaft seal for Th-400 (http://www.hotrodders.com/forum/output-shaft-seal-th-400-a-189236.html)

Titanium 12-17-2010 12:09 PM

output shaft seal for Th-400
 
Hey guys i'm having trouble and i am very confused about this transmission. I cannot find a rear output shaft seal for this 400. the transmission is out of an 86 c10. i've gone to napa, o'reilly and autozone and every rear seal they give me is just barely to big to fit. Whats going on here? I know for a fact this transmission is a 400. Are there any other transmissions that have tail shaft housings that are interchangable with the 400?

prostreet6t9 12-17-2010 12:20 PM

2 different seal can be in your 400. If your slip yoke has a 1.875 seal surface use a National# 9449. If the seal surface is 1.687 use National# 7038SA.

Titanium 12-17-2010 12:23 PM

i've tried both of those seals...thats why i'm confused.

prostreet6t9 12-17-2010 12:23 PM

Is the OD or ID wrong ?

prostreet6t9 12-17-2010 12:30 PM

You sure its a Th-400? The Modulator is on the front RH side close to where the filler tube goes into the case?

prostreet6t9 12-17-2010 12:38 PM

Can you see any numbers off the old seal? If not,measure the OD of the old seal and then measure the seal surface of your slip yoke and post them.

Titanium 12-17-2010 01:56 PM

i will post the numbers and the diameter of the seal within the next couple hours. its for sure a 400 judging from the pan shape and length of the case.

sqzbox 12-17-2010 02:15 PM

tranny ID
 
1 Attachment(s)
That would be #4 right?

matts37chev 12-17-2010 07:58 PM

what are the other ones in the numbered pic?

SSedan64 12-18-2010 02:19 AM

Quote:

Originally Posted by matts37chev
what are the other ones in the numbered pic?

Look about 3/4 way down the page here>> http://www.maliburacing.com/auto_tranny_id.htm

SSedan64 12-18-2010 02:50 AM

Quote:

Originally Posted by Titanium
i will post the numbers and the diameter of the seal within the next couple hours. its for sure a 400 judging from the pan shape and length of the case.

Check the Spline count on the Output Shaft. Is it 32-spline or 27-spline?
TH400 has 32-spline count, TH375 has smaller TH350 size 27-spline count and a TH400 pan shape, the bushing is smaller on the TH375. It will have a 9-1/2" tailhousing also.

"" A medium duty version of the TH-400. On the underside of the trans, right where the tail housing bolts up, the letters "TH-375" can usually be found cast into the trans housing.""


From here:
http://www.442.com/oldsfaq/oftrn.htm...n%20Comparison

http://www.442.com/oldsfaq/oftrn.htm...Identification


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