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Click on image for the lowdown. 
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| | | Forums66 Topics128,069 Posts1,055,884 Members48,428 | | 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
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Mar 2008 Posts: 1,775 'Bolter | | 'Bolter Joined: Mar 2008 Posts: 1,775 | 50w non-detergent is not made for hypoid or helical cut gears. Not good for rearends. That's where the 90w gear oil comes in. I remember a fellow 'bolter using 50w not too long ago in a SM420 trans with less than satisfactory results. He soon changed to 80w90. http://castrolhdfocus.com/index.php/understanding-the-differences-in-gear-oil-specs/ | | |
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