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Old 10-09-2023, 02:26 PM   #176
70STOVEBOLT
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Re: 4L80E & TH400 Tech.
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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.
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Old 10-10-2023, 08:31 AM   #177
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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.
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Old 10-10-2023, 08:32 AM   #178
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Re: 4L80E & TH400 Tech.
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Originally Posted by 70STOVEBOLT View Post
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
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Old 10-10-2023, 08:49 AM   #179
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Re: 4L80E & TH400 Tech.
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It's out about 1-1/8
Ah, ok. The one pic showed the yoke all the way in.
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Owner installed options:
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Cigar Lighter
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Deluxe Side Markers
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Power Windows
Power Locks
Sniper EFI

2015 Silverado 1500 LS 4.3/6L80/3.23 lowered 2" front & rear
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Old 10-10-2023, 09:14 AM   #180
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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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