[WishfulSS]

Originally Posted by Jastone

That is the correct gear fluid. Look in the performance supplement and you'll see that the fluid specs in there are for ZL1 models only. It states refer to the owner's manual for 1le equipped vehicles.

Cross reference owners manual part number Dexron LS gear oil GM part number 88862624.

Are you getting confused about the eLSD clutch fluid? That fluid is NOT what needs to be changed after 1500 miles and before the first track day.

As mjk said, it's very easy and intuitive to changes rear gear oil.

Raise vehicle,
Remove fill plug,
Remove drain plug,
Drain oil,
Replace drain plug,
Fill rear end with fluid (1.2qt)
Replace fill plug,
Lower vehicle,
Drive vehicle for a few circles (left and right),
Raise vehicle,
Remove fill,
Check level (fill as needed),
Reinstall fill,
Lower vehicle,
Done

I think the confusion is believing the eLSD constitutes the need for different "gear oil", that's false. The eLSD needs a separate change (when needed, not after 1500 miles) of clutch fluid 5.4oz.

For a simple gear oil change, nothing is special or different for 1le equipped vehicles

If we use a different gear oil, say Redline 75W-90 does the diff need the friction additive? Redline says it meets the GM spec for "Dexron®L.S. Gear Oil 88862624". Does GM sell it separately? Do we have a part number?