Posted this already but deleted it by accident when trying to edit (ROOKIE)
Have a problem with my 92 yj np231 transfer case rear output oil seal leaking. Replaced oil seal once which seamed to work for a few months but now it's leaking again.
Open to any suggestions or ideas.
I recall someone else having that problem. He had to replace the seal like 3 or 4 times before it finally sealed up. Is this a cheapo seal? Sometimes discount suppliers don't keep a very close eye on tolerances. Maybe try a different brand of seal...just my $.02....
I went thru 3 or 4 before I found one that worked, NAPA was the winner. I eventually got smart and started test fitting them to the drive shaft before I installed them. The NAPA seal fit snug around the shaft, the others were loose.
I'll have to do that as well as the input to the rear axle I've been told that the shop can do it for $150. I'm wondering if this is a easy project to do myself? (I use my truck for work, I only get about two days to work on the truck)
It turns out that my drive shaft is undersized to what all the part books (even the Jeep dealer) call for. Took the d/s to a bearing outfit who measured it and sold me a smaller seal with a nice tight fit.
Third and final seal,hopefully!
I had the same problem on my NP231, the tranny shop showed me why....the bearing inside the nose cone (looks like a sleeve)was worn and needed to be replaced. It should slip over the drive shaft nice and snug. If it has some play, a new seal will eventually start dripping. Hope this helps.