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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!
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| | | | Joined: Mar 2011 Posts: 204 'Bolter | | 'Bolter Joined: Mar 2011 Posts: 204 | i have a 55 1st. series 3600 with a four speed transmission,(i dont use the first gear) that i can get up to 55 mph but the engine is screaming.i have the truck for light lumber yard pick-ups and do not plan on towing. the numbers on the rear are NG1007 (on top) and 8699535 (on the drivers side).can anyone tell me what gear ratio i have and what gear ratio i would want? i do not intend to go faster than 60 mph. | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 |
NG = 3600 rear-end/axle made in Detroit, 4.57 ratio
with 15" standard wheel/tires, your RPM at 60 MPH would be about 3,300
| | | | | Joined: Mar 2011 Posts: 204 'Bolter | | 'Bolter Joined: Mar 2011 Posts: 204 | thank you tim. any sugestions on what ratio would be best for me. | | | | | Joined: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 |
Wait to see what someone with experience posts. I think people have posted information about hard-to-find 4.10 ratio rear gears. Other options would require changing out the entire rear end. Have you done work like that in the past?
| | | | | Joined: Mar 2011 Posts: 204 'Bolter | | 'Bolter Joined: Mar 2011 Posts: 204 | no i haven't done anything like that but i know this site is the place for all the answers. i'm in no rush to do it but i saw an ad in the swap meet section for a rear(the ad was for an 8 bolt, i would need a 10) i think it was from a 65. i also read about it in the tech tips. | | |
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