rear diff oil burnt! Help!

[j cAT]

Originally Posted by dlstewart01

The G-80 is the Eaton locker. When one wheel spins 100 or so RPM faster than the other both wheels lock. They unlock over 25 MPH.

Have a good one,

Don

I have found when doing my defective park brakes that 2/3 rotations of the rear wheel with the other wheel on the ground will engage the lock....


so whenever I do the park brakes I must lift both wheels off the ground to properly adjust the shoes.......

speed is not a factor ...just simple rotation will get it to lock/unlock....

[jdmccright]

Thanks for the clarification though I'm concerned that the repair manual says it is required.

Perhaps then the opposite is true in rognmel's case...an additive was used when it shouldn't have? Think I'll stand on the sideline from now on on this topic. Thanks again for the great input.

[jdmccright]

Here's a thread I found that has a good explanation from Eaton on the proper lube to use and break-in procedure for new trucks:

http://www.gm-trucks.com/forums/lofi...php?t5652.html

Basically, pre-1998 axles should use mineral-based oil, not synthetic. And neither call for a friction modifier. Finally, they recommend a GL5-compliant, 70W-140 weight for heavy trailer towing.

Talk about a crash course in rear diffs....

[dlstewart01]

How G-80 works

http://www.youtube.com/watch?v=KbMZ9...eature=related

You can click on other G-80 videos to the right of this one.

[j cAT]

Originally Posted by jdmccright

Thanks for the clarification though I'm concerned that the repair manual says it is required.

Perhaps then the opposite is true in rognmel's case...an additive was used when it shouldn't have? Think I'll stand on the sideline from now on on this topic. Thanks again for the great input.

I was checking your 100rpm statement....It appears that if the vehicle speed is under 20mph and there is a difference of 100rpm the rear wheels will FULLY lock....

with my problem encountered when working on the park brakes this is what is called the PARTIAL locking .. obviously the partial locking I encounted was sufficient to prevent my park brake adjustments as I could not rotate the wheel...off the ground..


above 20mph the locking is cut out ....I never knew that ....

[bigbadram51]

Ahhhh....The G80 a time bomb just waiting to go off. I have seen quite a few of them grenade, most with people running over size tires. BUT have seen it on stock tires as well.