G80 "normal operation"?

arlon · Post by **arlon** » Mon Apr 09, 2012 8:54 am

My van has the G80 locker and I noticed that the rear wheels seem to be locked all the time. I did some messing with tires this weekend and when either wheel is lifted off the ground it's locked. Is that the way it's supposed to be? Makes it handy for breaking loose lug nuts with a wheel off the ground.

astrozam · Post by **astrozam** » Mon Apr 09, 2012 10:02 am

If you have both rear wheels in the air and you spin one ( lets say clockwise ) does the other tire move in the same direction ( from your viewpoint ) or opposite?

Kidhauler · Post by **Kidhauler** » Mon Apr 09, 2012 11:03 am

If you had one wheel in the air only and the van in park the wheel will not move.

LiftedAWDAstro · Post by **LiftedAWDAstro** » Tue Apr 10, 2012 4:36 am

Kidhauler is right. Whether an open or posi rear, having 1 tire in the air and the transmission in park will not allow the free tire to turn.

To go along with astrozam, if you have both tires in the air and spin one CW, the other will go CCW whether you have an open diff or the G80 posi. The reason for this is the Gov-Loc posi only actuates under torque. Spinning by hand most likely will not produce enough torque to lock it up.

Post by **MountainManJoe** » Wed Apr 18, 2012 4:18 pm

The G80 is speed biased, not torque biased. It should lock when there is approx 100 RPM difference between two wheels.

I was able to test my G80 by lifting all four wheels off the ground. I carefully held one wheel stationary with my hands while a helper operated the gas pedal.

Kidhauler · Post by **Kidhauler** » Wed Apr 18, 2012 8:45 pm

The other way to test is lif one tire off the ground and block the axle if the truck drives off the block then the posi works.

Post by **MountainManJoe** » Wed Apr 18, 2012 9:30 pm

That won't work with his AWD because the front wheels will pull it off the block.

1Gary · Post by **1Gary** » Thu Apr 19, 2012 4:22 am

Ya know,service with a fluid change wouldn't be a bad thing.So a visual with the rear cover off sure would confirm what he has.

arlon · Post by **arlon** » Thu Apr 19, 2012 7:41 am

I know the G80 is working, I just thought maybe it was working too well (like stuck in locked mode). Fluid change is in the near future so I'll be able to see what's really heppening in there then. Thanks for the comments!

Post by **MountainManJoe** » Thu Apr 19, 2012 9:15 am

If the rear axle was locked all the time, you would hear some tire chirping in tight turns.

Chevy & GMC Vans

Chevy & GMC Vans

G80 "normal operation"?

G80 "normal operation"?

Re: G80 "normal operation"?

Re: G80 "normal operation"?

Re: G80 "normal operation"?

Re: G80 "normal operation"?

Re: G80 "normal operation"?

Re: G80 "normal operation"?

Re: G80 "normal operation"?

Re: G80 "normal operation"?

Re: G80 "normal operation"?