I've had a leak coming from my pinion seal for alittle while and finally got around to fixing it this weekend and damned if it aint still freakin leakin. Anyone had this problem, I could use some adivice. Truck is a stock 99 5.3 ecsb with 3.42s and a locker.

 

I had the same problem. What type of seal did you use. When I had my gear put in, i used the one that came with the installiation kit, the guy said it was a single lip seal, and that it was probably going to leak. I did not believe him so I had him put it in anyway, guess what it leaked. He told me I needed to go to gm and get a factory gm seal. They are double lip?? Anyway, he put in the factory seal and I have not had a problem. It is only like 12 bucks I think.

 

I bought one from Oreily's and i'm pretty sure it was double lipped. I think ill go ahead and buy the factory seal and see where that takes me. Thanks for your input

 

the ones from o reiley's are much better, they are just like the factory ones. i had the same problem using one from 4wp's install kit. i believe the brand from o reileys was federal mogul or something??

 

you probably put back the wrong seal, i installed the one that came with my gear installation kit and it was the wrong one b/c it started leaking. got a new one at advance auto, works fine now, no leaks.

 

Get a new gasket, or use the silicon gasket maker. I used the silicon gasket maker on my mustang, no problems.

 

i think he's talking about the pinion seal, not the cover seal, lol. i did the same as you on my chevelle, no problems.

 

mahe sure your yoke doesnt have a groove starting to wear in it from the old seal if there is try sanding it with emory cloth

 

I haven't seen 1 go bad yet.

The gasket from AAM is shaped to allow oil to flow into the axle tubes, if you use silicon you might block the holes.
Older Imapla's had the same problem with blocking the tube holes.