Hello everyone I hope someone can help me. I have a 1999 Suburban 1500 2WD 4L60E Auto transmission. The truck has a 6 inch Fabtech lift with 35 inch tires. A few weeks ago I was driving to work about 60 miles and my output (tail) shaft seal fell out, I replaced it with a new one and replaced the filter and fluid as well. Haven't driven the truck since then really except around town to the store and back. Last week I left for a trip to Arizona and I got about 100 miles out and I saw fluid spraying out of the rear of the truck, sure enough the seal fell out again. I rarely ever drive the truck so I am completely lost of how this can happen within 200 miles of replacing the seal.

Has this happened to anyone else or heard of it happening?? Any help is much appreciated, thank you for your time.

 

is it actually coming out whole or being torn or falling apart? How long has it had the lift?

 

any vibration detected?

 

It's popping out as a whole with no damage. Another site said to check the bushing because a guy had the same problem and it was the bushing that forced the seal out. I checked it today and the bushing is still recessed in. I'm going to have to pull the tail housing off for further inspection. The lift has been in there a while, I bought it from a guy a couple months ago and he had the transmission rebuilt last year with receipts to prove it. Makes no sense it would be having problems this quick after a rebuild especially.

No major vibration that I can tell, I noticed it briefly when I hit 80mph or so but I decelerated at that point anyway because I don't drive that fast. So I couldn't tell for sure what type of vibration it was.

 

ok.... was wondering if the driveline angle was over 3* but if its smooth at 80, your probably ok.

 

You have receipts; maybe talk to the shop that did the rebuild?

 

Maybe, you know how shops are now a days. Warranties don't transfer owners. You think it would be the trans or possibly an unbalanced driveshaft?

 

Looks like there is slop/wiggle in the output shaft. Going to have to pull the tail shaft cover off on Saturday. Any thoughts?

 

measure the driveline angles. if to large, a resonance will set up that will damage the tailshaft.