Swapping differentials from an 89??

[1969 GMC]

Originally Posted by bigtruck81

its a half ton suburban, you're going to want to pass on it as its got an 8.5" 10 bolt out back. G80s in these are garbage, and the 8.5" ring gear is the smallest GM has ever put into a fullsize truck. i broke the one in my 91 on bald 30" tires, and dry pavement with normal driving.

you're actually probably better off with whatever came stock in your truck.

Yes, there is no advantage whatsoever to swapping newer half ton axles under yours unless you want to get away from drum brakes up front (but since you already have discs....)

I'd pass.