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-   -   4L80E & TH400 Tech. (https://67-72chevytrucks.com/vboard/showthread.php?t=668062)

70STOVEBOLT 10-09-2023 02:26 PM
Re: 4L80E & TH400 Tech.
 
Quote:
Originally Posted by KQQL IT (Post 9248625)
Is clinebarger still active here?

Did a 4l80 in my 73 and the tailshaft won't stop leaking 2 bushings 3 seals and all I've made it do is leak worse.
It looks like your driveshaft may be too long. The slip yoke should not go all the way into the tailshaft on the transmission. It should stick out about 3/4 to 1 inch.

Stepside Jim 10-10-2023 08:31 AM
Re: 4L80E & TH400 Tech.
 
Google 4l80e rear seal and bushing issues. I believe there were two different bushings used over the years. Something like 40 or 50 thousands difference on the inside diameter.

KQQL IT 10-10-2023 08:32 AM
Re: 4L80E & TH400 Tech.
 
1 Attachment(s)
Quote:
Originally Posted by 70STOVEBOLT (Post 9248908)
It looks like your driveshaft may be too long. The slip yoke should not go all the way into the tailshaft on the transmission. It should stick out about 3/4 to 1 inch.


It's out about 1-1/8

70STOVEBOLT 10-10-2023 08:49 AM
Re: 4L80E & TH400 Tech.
 
Quote:
Originally Posted by KQQL IT (Post 9249104)
It's out about 1-1/8
Ah, ok. The one pic showed the yoke all the way in.

KQQL IT 10-10-2023 09:14 AM
Re: 4L80E & TH400 Tech.
 
a pic from the mockup. The yoke is long almost twice that of my 400 yoke I replaced


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