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| | | Forums66 Topics128,196 Posts1,057,388 Members48,469 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
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on the Internet for over 30 years! and not clogged down
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#1730 07/23/2004 12:57 AM | Joined: Nov 2003 Posts: 53 Member | | Member Joined: Nov 2003 Posts: 53 | 90w gear lube (usually marked "universal" or "multi-purpose") is specified for both your SM420 4 speed and Rockwell transfer case. That's another nice thing about our older trucks....90w is used in the transmission, transfer case, both axles, and the front axle joints. In the 70's they started the confusing habit of specifying 30w motor oil and ATF in some models. | | |
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