It appears after getting my Yukon 456 gears and Detroit trutracs front and rear installed i have a leak at the pinion seal. I only have 50 miles on the new gears and i am still a little gun shy. I noticed this today after a short trip when i exited the truck to a sweet aroma of burnt diff fluid. So when i got home i looked at it and it appears that the drive shaft has slung diff fluid onto my muffler and gas tank and underneath the bed of my truck. I have read up and think its a pinion seal but i am not sure. I had PORC install them into the carriers for me and i installed the third. So is this their problem to fix or might i have to suck it up and pay for it to be repaired. I gotta tell you guys this gear business gives me the chills. I love my little pickup and don't want to hurt her. I think its a pinion seal. If any of you have some advice i would surely appreciate it. Thanks Clint

 

The crush sleeve/seal can be a tricky deal. When I had my 4.88's installed I also developed a leak. I took it back to the place that did the work and they replaced it for free, and it only took about 10 min. But keep in mind that they did all the work. But if this place you went to did the the ring and pinion for you, I would say take it back. Sounds like there mess up to me.