98 z71 rear end leaking

[Jpwood]

I've got 98 z71. Rear end is leaking. I've replaced the pinion seal and checked the breather hose. It's still leaking. Stopped for a little while after I changed the pinion seal. And help would be appreciated.

Thsnks

[Mastercarpentry]

Unless something was damaged on the seal mating surfaces (inner and outer portions) it should not be leaking with the vent open. You may have gotten a defective part- that happens sometimes. Occasionally the spring inside the seal will break or become unseated. The only other cause I can think of would be excessive movement of the pinion shaft. Gear oil doesn't play well with most sealants. I use the old-fashioned gray "Permatex", a trace of that applied to the seal seating area when installing the seal always works for me.

Phil

[j cAT]

Originally Posted by Jpwood

I've got 98 z71. Rear end is leaking. I've replaced the pinion seal and checked the breather hose. It's still leaking. Stopped for a little while after I changed the pinion seal. And help would be appreciated.

Thsnks

with what you have that it did work for a bit I would guess the shaft may have a damaged surface. use some fine crocus cloth to smooth it out.
buy a GM seal . some times the seal is installed so it sits slightly in a different position so it rides on the shaft where it has never been worn down.

if this shaft has too much movement that also will do it.

[rhandwor]

Look at the seal if you didn't lube the inside of the seal or used a seal driver it maybe crimped. The nut has to be tightened properly.
A long 1/2 ratchet on the socket should be able to just hold vertical without rotating. Otherwise use a new crush washer.