Whats the best gear oil for trans,transfer,rear.

Topics about the engine, transmission, transfer, axles, or wheels/brakes of GMC 2 1/2 ton trucks.


Whats the best gear oil for trans,transfer,rear.

Postby leadfoot » Mon Jun 25, 2012 6:26 pm

have a napa close buy but it seems hard to find the 90 weight the TM lube order states. Thanks.
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Re: Whats the best gear oil for trans,transfer,rear.

Postby pfarber » Mon Jun 25, 2012 7:59 pm

90wt is fine.

Originally the trucks ran what is basically GL-1 (just about straight mineral oil with anti-foam additives). But now a days GL-5 is the easiest to find. Since there are no synchro's in the CCKW gear box you can safely run it there.
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