Re: SM420 and 44Axel
I run 90 weight mineral oil in my SM420, in my 1953, it has the early style synchros. The 64 GMC I use multipurpose gear lube, same as you can run in your rear end too, unless you have a powr-Loc rear end (posi)
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Steve Stock
Gig Harbor, Wa
1953 Chevrolet 3100
261 cu inch, SM420
Finished Cab off restoration
1964 GMC 1000
305 V6, SM 420
Restoration is now started, still looking for an oldsmobile style power steering pump
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