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Old 09-01-2004, 09:19 PM
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Sorry my message didn't post. I have a 4L80E with a leak only when driving. Unable to replicate on jack stands. Pan gasket looks good, rear seal looks good, cooler lines tight and flowing, u-joint cap looks good. Tranny will overheat, checked fluid level and mark on dipstick for accuracy. Tranny will leak even low on fluid but will not overheat a fast. Appears to leak from the rear on run down to the rear more on the passenger side does spray side to side from u-joint. Being that fluid is now low and same problem exists does this rule out venting. Any ideas appreciated.

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Old 09-01-2004, 10:41 PM
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You've checked the output shaft seal>?
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Old 09-01-2004, 11:46 PM
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Yes seal has been checked.
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Old 09-03-2004, 07:47 AM
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4l80e

trans does over heat??? your post said yes, then not as fast if I read correctly,what this tranny in. over heat while driving would tell me a no lock condition is the trouble area to look for .
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Old 09-04-2004, 08:31 PM
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Problem resolved. Two problems actually. Electric fan wired incorectly(nice move), not tested but assume will resolve overheat issue. Leak is caused by an O-ring that sits inside the tailshaft housing 4 or 5 inches. I am still not understanding why this makes the tranny leak because from what I can tell the O-ring seals fluid from an area that would already have fluid in it. By the way 4L80 is in a 70 El Camino and yes the lockup works.
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