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Rear end lube and noise
Hey all,
It's been a while since I posted something on the forum.
Anyway, I've had a mild nagging moan from the 10-bolt 3.73 rear end in my '86 Sub for a few years, usually only in the "float" or lightest of light acceleration. It's a wee bit louder these days at 145,000+ miles and I got to thinking a bit. This is where y'all come in.
GM specs 80W-90 for the rear diff. I was wondering if running 80W-140 would quiet things down a little. Since I only get 12-13 m.p.g. now, I don't see it hurting fuel economy too much. Anyone ever run a blend? As a kid, I heard about guys running the limited-slip additive to quiet even open diffs like mine.
I do tow a 3,500 pound boat/trailer combo on occasion; I've actually put 7,000 miles on the boat trailer over the years.
I've always just run the factory-spec lubes, but got to wondering. Any advice is appreciated. Thanks!
-Kevin
1986 Chevy Suburban C10 Silverado
350 SBC / TH700R4 / 3.73 / P235/75R15XL
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