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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: Oct 2010 Posts: 1,232 'Bolter | | 'Bolter Joined: Oct 2010 Posts: 1,232 | Yes - 1954 3100's had a 3.90 rear end.
Someone check my math ...
A 3.90 rear end will push your truck about 5% faster than a 4.11 at the same engine RPM.
@ 1:1 Top gear:
1 RPM at engine with a 4.11 = 1 / 4.11 RPM at wheels
1 RPM at engine with a 3.90 = 1 / 3.90 RPM at wheels
Rear wheels spin 1.0538 times faster at same engine RPM with 3.90 than with 4.11.
(4.11 / 3.90 = 1.0538)
At same engine RPM -
> 50mph with 4.11 = 52.7mph with 3.90 = (50mph X 1.0538)
> 60mph with 4.11 = 63.2mph with 3.90 = (60mph X 1.0538)
Replacing the rear end is your call.
A previous owner replaced the 3.90 in my '54 3104 with a 1950 4.11. I don't feel that I would gain enough to justify changing back to a 3.90 other knowing that I have the correct rear end. My ol' truck is no speed demon, so it's a moot point.
- Lonnie
- Lonnie My '54 3104Photos that I have shared on Stovebolt via PhotoBucket are no longer available. Please contact me if you want a photo from an old post. lonniecook [at] aol [dot] com. I sold my '54 3104 12/12/2017, but I still visit Stovebolt. OLD STUFF ... houses, furniture, cars, wine ... I love it all | | |
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