What type of rear differential fluid does the 2001 chevy 2500hd use?

The type of rear differential fluid the 2001 Chevy 2500hd uses iS75w-90. This part will need to be replaced eventually. You should change Your tires every 30,000 to 50,000 miles or so. You don't want to get into any wrecks on the road. Making sure Your tires are in the greatest of condition is crucial to not crashing. You will come into problems with this car part at some time or another. You could face cupping problems. Premature tire wear is something to be on the lookout for. You might run into feathering issues. Make sure to check the tire pressure once a month. The part may become loose at some point. Check for holes, in case You run over a pothole.