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Old 03-11-2013, 11:36 PM   #1
cjohnson6772
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4L80e seal part numbers

I've searched unsuccessfully for these part numbers online. Any help is appreciated. 2001 4L80e looks good. I just want to replace front (pump) and rear seals before installatio
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Old 03-12-2013, 10:20 AM   #2
Wasted Income
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Re: 4L80e seal part numbers

TIMKEN 4598 Torque Converter Seal
TIMKEN 9449 Extension Housing Seal
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1964 Buick Skylark Twin TURBO 383 LS pro-touring project
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Old 03-12-2013, 11:12 AM   #3
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Re: 4L80e seal part numbers

Quote:
Originally Posted by Wasted Income View Post
TIMKEN 4598 Torque Converter Seal
TIMKEN 9449 Extension Housing Seal
Awesome! Thank you my googlefu seemed to have failed me this time
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Old 03-12-2013, 11:10 PM   #4
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Re: 4L80e seal part numbers

Couple of follow up questions. I replaced my filter tonight and torqued the pan down to 30 ftlbs. Does that sound about right since the threads are in aluminum?

My bigger question is around the yoke: I know the factory 4L80e yoke was bolted on a had an oring to seal the inside of the yoke to the shaft. I've been told that a th400 slip yoke will work. I know there is a long and a short 400 yoke. I have a short 400 yoke here. The spline fit and it a non vented yoke so it shouldn't leak. Is this the right yoke for what I'm trying to do?
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Old 03-13-2013, 08:54 AM   #5
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Re: 4L80e seal part numbers

Yes a TH400 slip yoke will work. You just need to make sure that it won't
1) Bottom out in the trans when the suspension is fully compressed
2) That there is still enough spline engagement when the suspension is fully extended.

There is a rule of thumb out there for spline engagement, but I can't remember it off-hand.
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1972 2wd K/5 Blazer Turbocharged 370 LSx - 941 rwhp / 1093 rwtq
1969 Chevy K-10 L33 5.3 / 4L80E / NP241 / 4" lift
1964 Buick Skylark Twin TURBO 383 LS pro-touring project
2014 VW Passat TDI - Daily Driver
Turbo diesel
2015 Sierra Denali HD Duramax Turbo diesel
2023 Ford Explorer ST - Twin Turbskis
2023 Ford F150 RCSB - Whipple Supercharged
2017 Polaris RZR Turbo
2014 Nor-Tech Center Console - Twin Supercharged Outboards

TURBO ALL THE THINGS!!
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Old 03-13-2013, 08:56 AM   #6
cjohnson6772
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Re: 4L80e seal part numbers

Quote:
Originally Posted by Wasted Income View Post
Yes a TH400 slip yoke will work. You just need to make sure that it won't
1) Bottom out in the trans when the suspension is fully compressed
2) That there is still enough spline engagement when the suspension is fully extended.

There is a rule of thumb out there for spline engagement, but I can't remember it off-hand.
This was my gut feeling but thank you for confirming. I guess I'll try to cent the splines at ride height.
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