M1028 Rear Axle Seal

[L B]

Quick question for those that have dealt with it:

Do the rear axle shafts have an inner shaft seal at the differential?

I've looked in the TMs and through this and other forums online but can't find an answer one way or the other.

I'm currently trying to stop gear oil from trashing my rear brakes and am unsure if the gear oil should be making it into the hubs or not. It seems like it shouldn't be since it just washes away bearing grease, but I also can't find any mention of a seal. I do plan on changing the wheel seals on the hubs while I'm at it, but I just replaced these 2 years ago and the spindle looks fine so I'm trying to look for other causes.

Thanks in advance,

-LB

 

[Curtisje]

No sir. Just the bearing seal in the wheel hub/brake drum.

And then the gasket on the axle flange to the hub.

Good luck. Maybe try smoothing the spindle surface with some emery paper?

 

[ehuppert]

Make sure the diff vent is working. If clogged it can build pressure when it warms up and push oil past seals....

 

[cucvrus]

As a rule I replace the axle drum hub seals every time I have to remove the hub and drum. That brake lining is more expensive then the seals and it assures you have a great new seal. But I do see hubs that have a groove worn into the axle stub. They make a seal saver for the 14 GM cooperate rear. https://www.skf.com/us/products/ind...smission-seals/wear-sleeves/skf-speedi-sleeve
A speedi seal. I don't have the measurements but I am sure this will help. I seen them on older plow trucks.

 

[L B]

Make sure the diff vent is working. If clogged it can build pressure when it warms up and push oil past seals....

This was the issue, thanks for the insight. Pulled the hose off of the fitting and it was completely caked solid with mud and grease. I never would have thought to check.

-LB