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Jul 21st, 2025 | | | | Joined: Jan 2004 Posts: 188 Shop Shark | | Shop Shark Joined: Jan 2004 Posts: 188 | I'm trying to determine whether this'54 Chevy has the original differential on it. The engine seems to be winding pretty high in third at 50mph its 2,200rpm.
It has the 235 and standard three-speed with 6.50 16LT tires with full tread. I've tried to make-out the numbers on the diff, even with it all cleaned up I still can't read them. It should be a 3.9 to one ratio if its the original diff.
Anyone have any experience with this?
| | | | | Joined: Jan 2001 Posts: 5,320 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,320 | You may need to pull the back cover to see the tooth count.
It could have been changed to a 4.11 at some time.
See the USA in your vintage Chevrolet! My Blog | | | | | Joined: Apr 2005 Posts: 2,832 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 2,832 | Don't know for sure how tall a 6.50x16 tire is but guessing about 28.5". If that is close then 2200rpm with a 3.90 rear would give 48mph so I'd think your rear gear is stock.
Evan
| | | | | Joined: Jan 2004 Posts: 188 Shop Shark | | Shop Shark Joined: Jan 2004 Posts: 188 | Thanks, I'll check the tire. | | | | | Joined: Jan 2004 Posts: 188 Shop Shark | | Shop Shark Joined: Jan 2004 Posts: 188 | Tires measure 29.5 tall with the truck jacked up and wheel just touching the floor. I'm not sure that is the correct way to measure how tall it is. | | |
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