ok well i was playing around at lunch with my blazer and his zr2 and we were playing around in a ditch and i flexed my truck completly out so much that the passenger rear tire was barely touching the ground and my posi would not fully engage it would sort of catch and then stop ( we were playing in 2wd) so i didint make it up the ditch so my question is
what is wrong with my posi its the gu6 rear end code and the posi works fine on gravel and pavement but doseint worked when flexed out. so please help me

 

You have the G80 RPO code? or an aftermarket posi-traction unit?

 

i have the g80 rpo code

 

Sounds like you have a defective unit. How much were you rev'ing the motor?

 

G80 don't like, or take alot of abuse. I've seen alot of them fail on the FSC.