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You have to see which version differential your truck came with. The fronts are open. The rear can be a traditional G80 or an electric locker, I forget the RPO.
I thought the 21+ was only an electric locker that was only available with the Z71 off-road performance package or whatever they called it...was the G80 only available on non Z71 models or?
There is a mechanical limited slip (G86) and an electronic limited slip (G96). So, the G80 apparently is the code for the locking limited slip used in solid axles. I stand corrected!
Thought G80 was an On/Off, no 'limited' slippage?
Yes the G80 is locked or it's not locked. The G80 only came with the solid rear axle, it locks at wheel speed less then 20mph or 100 rpm differance between left and right wheel spinning. Alot of people don't know how use the G80 when there stuck as they mash the gas and exceed the 20mph wheel speed and it never locks, key to using a G80 is low wheel speed under 20mph and you will feel it engage.
I read somewhere that it's possible to physically 'tune' the clocksprings in it to adjust the difference in wheelspin required,
Even if its true I would no way modify it to do that, it engages pretty hard at 10-15mph wheel speed much less 25mph wheel speed anything higher with the mod as I never heard of your going to leave parts behind inside the diff. I Usally try to have it at about around 5-10 mph till it engages.
