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Mod | | | Forums66 Topics128,183 Posts1,057,263 Members48,467 | | 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!
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| | | | Joined: Jul 2010 Posts: 65 Wrench Fetcher | | Wrench Fetcher Joined: Jul 2010 Posts: 65 | My Truck can only do about 40 MPH top speed.
Have been thinking of changing the diff from the existing 4.1 to 3.55 Ratio
Jimmy Carter as these parts for sale (itemHP163)but only for 1940-1954.
I understand that with some modification these will fit a 1937.
Any one know what modification is required?
Thanks | | | | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | This can only be done by changing to a 1940 or later hypoyd rear end. I could talk you through it but this would be a big job.
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