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Rear Seal Oil Leak

Already Replaced, but still leaking

Rear Seal Oil Leak

Postby mjkingston [OP] » Apr 01 2013, 5:00am

Oil started leaking at the drive shaft connection to the transmission. I bought a seal at O'Reiley and installed it with what I thought no trouble. I drove only a short distance since the replacement but find oil at the rear seal again. Is brand of the seal significant? I'm not sure how a turning driveshaft can seal in oil at a rubber contact point. What else is likely the cause of the leak? The oil is black, but the last transmission change was less than 30000 miles ago.
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Re: Rear Seal Oil Leak

Postby ASTE25 » Apr 02 2013, 4:47am

Can you post a pic? The leak may not be coming from that seal.
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Re: Rear Seal Oil Leak

Postby mjkingston [OP] » Apr 06 2013, 3:08am

I got a new seal and went under the truck today ready to try again in case I caused the damage. The original leak was sporadic but making stains wherever it was parked. Now, it's covered about an area about 2/3 the size of the truck. I have some cleanup to do. The seal is dry. Completely. The oil is on the u joint. I did not redo the work today. Pictures are posted of the oily ujoint and the dry seal. When I pulled the shaft oil came out of the front of the drive shaft, it's hollow in front of the front ujoint. The oil is black. The truck has about 140k on it. I think I'll need assist on this one. I'm not into pulling the transmission down. There is little to no play in the shaft, but I don't know what is acceptable. A very slight movement but a very small amount.
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Last edited by mjkingston on Apr 06 2013, 3:19am, edited 1 time in total.
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Re: Rear Seal Oil Leak

Postby EKinMN » Apr 06 2013, 3:15am

You can post the pics right here in this thread. Read here if you need help: How to share photos at SilveradoSierra.com
Looking forward to helping you out!
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Re: Rear Seal Oil Leak

Postby ASTE25 » Apr 06 2013, 3:37am

It looks like the plug in the back end of the yoke and in front of the u-joint is leaking.
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