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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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| | | | Joined: Mar 2010 Posts: 10,282 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,282 | That 3.38 set of gears will make your current granny first gear of that SM 420 usable from a standing start.
That gear set will also allow you to you reach highway speeds without the engine screaming.
If it starts lugging in forth gear on hills, just downshift into 3rd.
I had a rear axle with 3.08 gears and a Saginaw 3 speed with a 235 in a '50 3100, and it had no torque in first gear, but highway speeds were very pleasant.
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
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