I should know the answer

[Don W.]

but I don't. We are suposed to have locking rear difs, that much I know. But with both rears off the ground I can spin one one way the the other turns the other way just fine. BUT, my question is there's NO resistance. Shouldn't there be some drag with a limited-slip dif in there?

I remember seeing another thread where they took their dif apart and there was no limited-slip so just wondering. Also I seem to remember trying this a long time ago on a known limited-slip and they both turned the same direction causing the driveshaft to turn as well.

 

[jwaller]

Re: I should know the answer

what your seeing is normal.
you need to put one tire on the ground and send power to the rear and see if the one on the ground pulls or the one in the air. I remember you need about a 1/4 turn before it should engage. if the one on the ground pulls while one is in the air your good.



we have the gov lock G80 code(unlimited slip) and it will disengage abour 30mph as well.

 

[Don W.]

Re: I should know the answer

Thanks, I give it a shot...

 

[big gear head]

Re: I should know the answer

The differential that is used in these trucks is the Eaton Governor Lock. It has a governor in it that allows the differential to act just like a standard differential until one wheel starts to spin at a much greater speed than the other. When this happens the governor engages a cam that applies pressure to the clutch pack and locks the differential. You can test it by removing the wheel and brake drum and turning the axle as quick as you can and see if it locks. You can't turn the wheel quick enough to lock the unit, but you can turn it quick enough with the wheel removed. This is not the best differential for the application, but it is all that GM used at the time. A good upgrade would be a new Eaton posi.

 

[turbodog]

Re: I should know the answer

If you use Waller's test method, be sure to think it thru and be careful.... don't ask how I know....