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Labor Day Putting down your wrenches or time for
MORE wrenching? 
Plenty of places to share. | | Click on image for the lowdown. 
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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!
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| | | | Joined: Oct 2006 Posts: 9,671 'Bolter | | 'Bolter Joined: Oct 2006 Posts: 9,671 | I'm just relaying my personal experience with the SM420 four speed transmissions Les. I'm sure they make synthetics for the
limeted slip differentials and you may be just fine in the manual transmissions with less massive components in them. bout
the only thing I could say is to try them if you want and see how they perform in your vehicle. I can't see any reason why
they wouldn't add many more miles to your vehicle if they perform ok with the synthetics.
DG
Denny G
Sandwich, IL
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