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turbo 400 rear seal
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87IrocTim
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PostPosted: Tue Aug 23, 2011 5:20 pm    Post subject: turbo 400 rear seal Reply with quote

im about ready to finish this car and drive it for the first time, until i slide the driveshaft in. the spline on the yoke is correct, the seal in the tranny is too small. can anyone help me find the part number for the correct seal? positive its a 400 because of the texas pan and the spline on the yoke being correct. this driveshaft went to a turbo 400 previously. thanks
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clay
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318129.23 points


1972 Chevrolet Nova

PostPosted: Tue Aug 23, 2011 9:36 pm    Post subject: Reply with quote

I've tried to look up some specifics to help you with exact year breaks, couldn't find any but I know exactly what you are describing. The 400 I have in my car was an early model with the canister style filter (67 I believe) and it had a different tailshaft housing that had a smaller seal o.d. and i.d. I don't think the seal you need will fit in the housing you have (I just went up to the shop and checked). It's not as simple as a different seal as on mine the tailshaft bushing i.d. was too small for the "standard" size yolk you probably have. I had to borrow a later model tailshaft housing from my buddy that was running a GearVendors and didn't need it any more. If you want me to take some measurements on diameters let me know and I might can get them tomorrow morning before I go to work. Clay
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af2
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1933 Willys Coupe

PostPosted: Tue Aug 23, 2011 9:38 pm    Post subject: Re: turbo 400 rear seal Reply with quote

87IrocTim wrote:
im about ready to finish this car and drive it for the first time, until i slide the driveshaft in. the spline on the yoke is correct, the seal in the tranny is too small.


NO way!!!
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af2
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Location: grassvalley, ca
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1933 Willys Coupe

PostPosted: Tue Aug 23, 2011 9:43 pm    Post subject: Reply with quote

clay wrote:
(67 I believe) and it had a different tailshaft housing that had a smaller seal o.d. and i.d. I don't think the seal you need will fit in the housing you have Clay


The bushing would never allowed it to slip on as said. The seal will go with the housing.

Rolling Eyes
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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Tue Aug 23, 2011 11:38 pm    Post subject: Re: turbo 400 rear seal Reply with quote

af2 wrote:
87IrocTim wrote:
im about ready to finish this car and drive it for the first time, until i slide the driveshaft in. the spline on the yoke is correct, the seal in the tranny is too small.


NO way!!!


ok, if the seal in the trans is too small, how did you slide the yoke in ? if the seal was too small for the trans, but correct for the yoke, then how was it in the trans ?

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af2 wrote:
It seems we can look at our magical Balls and come up with a fix?

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Paul P
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1971 Chevrolet Chevelle

PostPosted: Tue Aug 23, 2011 11:47 pm    Post subject: Reply with quote

Likely you have a TH375. Those were in some BOP cars and some Chevys.
It is a weaker version of the TH400 that has a 350 output shaft. I have seen one in an olds cutlass some years back. They can be upgraded to a 400 with some parts without too much trouble.

Here is something from an olds site.

http://www.442.com/oldsfaq/oftrn.htm#TRAN%20Auto%20Transmission%20Identification

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af2
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1933 Willys Coupe

PostPosted: Wed Aug 24, 2011 1:58 am    Post subject: Reply with quote

af2 wrote:
clay wrote:
(67 I believe) and it had a different tailshaft housing that had a smaller seal o.d. and i.d. I don't think the seal you need will fit in the housing you have Clay


The bushing would never allowed it to slip on as said. The seal will go with the housing.

Rolling Eyes


Clay the rolling eyes are not meant at you.

As 10 said ?
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clay
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1972 Chevrolet Nova

PostPosted: Wed Aug 24, 2011 7:55 am    Post subject: Reply with quote

Gotcha. I don't know if it's a truck vs. car thing or just a year thing. Mine was originally in a truck. It was a 1 ton long bed stepside 67 with a 292 six cylinder if that helps. It was the early style with the brass canister filter that I converted to the later model style filter. Had to buy a pan also to do it as the early pan was too shallow. Clay
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Paul P
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1971 Chevrolet Chevelle

PostPosted: Thu Aug 25, 2011 12:15 am    Post subject: Reply with quote

It's a TH375 period end of story. Get the parts to convert it to a TH400 or get a PG/TH350 yoke to fit. Not the strongest trans to have behind a tall deck big block with a blower..... Rolling Eyes
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2001 Focus 2.0 Zetec
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15.63@87 MPH 1/4mi

1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
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af2
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1933 Willys Coupe

PostPosted: Thu Aug 25, 2011 6:55 pm    Post subject: Reply with quote

Paul P wrote:
It's a TH375 period end of story. Get the parts to convert it to a TH400 or get a PG/TH350 yoke to fit. Not the strongest trans to have behind a tall deck big block with a blower..... Rolling Eyes




How would the 400 splines engage and the seal be wrong? The 375 has the TH350 shaft.
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Paul P
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PostPosted: Thu Aug 25, 2011 9:53 pm    Post subject: Reply with quote

I think a simple picture telling us what is going on would help a lot. Unless the seals are the same size and the 350 one was installed in the tail shaft housing instead of a 400 seal.....
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2001 Focus 2.0 Zetec
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15.63@87 MPH 1/4mi

1971 - Chevelle 408 SBC N/A
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10.78@122 MPH 1/4mi
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af2
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Location: grassvalley, ca
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1933 Willys Coupe

PostPosted: Thu Aug 25, 2011 10:47 pm    Post subject: Reply with quote

Paul P wrote:
I think a simple picture telling us what is going on would help a lot. Unless the seals are the same size and the 350 one was installed in the tail shaft housing instead of a 400 seal.....


Idea Maybe?
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87IrocTim
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PostPosted: Fri Aug 26, 2011 8:31 pm    Post subject: Reply with quote

ok i will try to get a picture, but it is certainly a turbo 400. the yoke has a good 3/4 to an inch before it butts agaist the seal, and is nice and tight on the splines. plus as far as i know, no th-350's have the texas shaped pan.

also, this driveshaft was previously on a th-400 so it is not a 350 yoke. but i will need a day or so to get you guys a picture but i wil have one up asap. oh and also, i have a yoke of a turbo 350 and it doesnt fit.

pictures on their way. thanks for the help so far.

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Big Dave
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PostPosted: Sat Aug 27, 2011 6:14 pm    Post subject: Reply with quote

You could always count the splines inside the yoke or on the out put shaft. A TH350 and the TH375 have 27 splines (if there is a wider groove where a spline is missing you count the missing spline). A TH400 has 32 splines.

Big Dave
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af2
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1933 Willys Coupe

PostPosted: Sun Aug 28, 2011 9:04 pm    Post subject: Reply with quote

87IrocTim wrote:
oh and also, i have a yoke of a turbo 350 and it doesnt fit.

pictures on their way. thanks for the help so far.



Just in case some didn't see it.
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