do you have to put grease in a rear end
It is actually gear oil, that is an old school term that comes and go's.
not grease, oil- like he said- but the GMC doesn't have a drain plug- too easy, I guess- so you have to replace the gasket when you do it- oh, wait a minute, does it have a gasket? I guess I'll find out when I change the oil in my diff- I put it off because it is a messy hassle-
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