So around Thanksgiving time I plan to do some work on my truck including replacing the rear diff fluid, but I keep finding conflicting information about the '96 G80 axle. On the GM dealer order catalog for Tahoe in 96 it specifically says the G80 is a locker, but on RPO decoders it says its a limited slip and even in the owners manual it lists it as one. So before replacing the fluid I want to try to figure out what is the preferred fluid for my rear and if anything else should be done to the rear at this time. I also will be replacing the factory cover with one that has a drain plug so fluid changes will be easier in the future.

I know that on the newer trucks the G80 is the locker, but in the 90's there seems to be a lot of conflicting information.