rear pinnion seal leak

[kovac]

my rear diff keeps blowing its seal , i just replaced it almost 4 months ago.any suggestions?

also my truck will idle very rough on cold days(-10 to -40 degrees celcius) help please. i own a 91 bronco, full size eddie bauer edition

 

[Billings Lee]

thats freaakkkkin cold man, but about the seal, get your drive shaft, r and p, pinion yoke, ect.., check out.

 

[Yardape]

Neverheard of that happening, are you sure it was installed properly? check the vent coming out the top of the diff, cannot be plugged