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johnr265 · 05-25-2015, 01:19 PM

Depends if you're tracking or not. For the rear diff, you want to use the stock GM fluid and friction modifier either way. Drain from lower plug after making sure you can open upper plug. Pour in whole bottle of friction modifier first, then whole bottle of 75W-90.

GM 75W-90 (88900401)

GM (88900330)

For the oil, stick with mobil 1, either 5W-30 if not tracking or 15W-50 if tracking. Uses about 10 quarts.

05-25-2015, 01:19 PM	#4
johnr265 Drives: '15 Z/28 Join Date: Dec 2014 Location: NJ Posts: 113	Depends if you're tracking or not. For the rear diff, you want to use the stock GM fluid and friction modifier either way. Drain from lower plug after making sure you can open upper plug. Pour in whole bottle of friction modifier first, then whole bottle of 75W-90. GM 75W-90 (88900401) GM (88900330) For the oil, stick with mobil 1, either 5W-30 if not tracking or 15W-50 if tracking. Uses about 10 quarts.