rear end leak repair

Discuss fixes, upgrades and modifications to your M37

Moderators: Cal_Gary, T. Highway, Monkey Man, robi

Post Reply
investig8
CPL
CPL
Posts: 115
Joined: Fri Dec 06, 2019 7:12 am
Location: San Antonio, Texas

rear end leak repair

Post by investig8 »

Good Afternoon All,
OK, so my truck is leaking from the rear end drive shaft yoke and I am needing to repair it. However, rear ends are one vehicle area I have no experience with. How difficult and what is involved in replacing that seal?
Thanks, Dennis
Elwood
MSGT
MSGT
Posts: 937
Joined: Mon Oct 24, 2011 9:34 am
Location: Water Winter Wonderland

Re: rear end leak repair

Post by Elwood »

It's probably the pinion seal that's leaking, not actually the yoke.

Lots of information here on this topic. Just do a search on "pinion seal".

Two pieces of advice: (1) getting the old seal out will probably be the hardest part of the job, and (2) do not install an NOS leather seal.
PoW
SSGT
SSGT
Posts: 489
Joined: Wed Nov 14, 2007 5:48 pm
Location: Hidden Valley, AZ

Re: rear end leak repair

Post by PoW »

I've seen oil leak from under the nut in the flange.

Some seal up OK, others not, especially if you run synthetic gear lube.

It will find ways out of cases you can't imagine.

If that is where it is coming from, a bit of sealant on the washer and nut will help.

PoW
Post Reply