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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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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#28320 10/29/2002 5:54 AM | Joined: Jun 2000 Posts: 2,773 'Bolter | | 'Bolter Joined: Jun 2000 Posts: 2,773 | SM420 is what came in the 3/4 & 1 ton models. Should be a bolt in, except for the closed driveshaft.
While the 3.90 gear is a little low for highway use, there's not much choice unless swap for a late model differential. That can get you 3.73 and 3.42 gears.
Fred
52 3600
69 C-10
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