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Click on image for the lowdown. 
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| | | Forums66 Topics128,014 Posts1,055,333 Members48,419 | | 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!
| | THANKS!
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: Oct 2012 Posts: 130 'Bolter | | 'Bolter Joined: Oct 2012 Posts: 130 | What wt oil/fluid and make does everyone use in a SM 420 transmission?
Also are there any additives that could be used to improve shifting?
thanks Doug | | |
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