I'm fixing to change the oil in my muncie and rear end...This is a 72. I'm going with Sta-Lube 85W90 GL-4 in the muncie. I'm pretty sure the rear end is still stock with around 100,000 miles. I am having no issues with it just need to replace the oil because I have no idea when it was changed last. Bought the car this past May.
Should I stick with GM or is there a better option...?
Are the GM part numbers listed below correct....?
GM gear oil part#89021671
GM posi additive part#88900330
The car will see under 2000 miles a year and not driven hard.
Brian
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