The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 47-59 1957 pickup rear axle?

mr48chev · 01-28-2022, 08:24 PM

As far as choosing a gear ratio this calculator is real easy to use http://advanced-ev.com/Calculators/TireSize/
Don't laugh because it is for electric rigs, you can plug in any three factors and get the fourth. You do have to factor the overdrive ratio of an overdrive transmission in the rear end gear ratio of the rig has OD.

I snooped on the Colorado forums today but couldn't come up with the info I was looking for. On one of them someone had posted rear axle widths for various models and had posted the codes for gear ratios.

Three ratios is what I find
GT4 Rear axle, 3.73 ratio
GT5 Rear axle, 4.10 ratio
GU6 Rear axle, 3.42 ratio

01-28-2022, 08:24 PM	#11
mr48chev Registered User Join Date: Jul 2007 Location: Toppenish, WA Posts: 15,307	Re: 1957 pickup rear axle? As far as choosing a gear ratio this calculator is real easy to use http://advanced-ev.com/Calculators/TireSize/ Don't laugh because it is for electric rigs, you can plug in any three factors and get the fourth. You do have to factor the overdrive ratio of an overdrive transmission in the rear end gear ratio of the rig has OD. I snooped on the Colorado forums today but couldn't come up with the info I was looking for. On one of them someone had posted rear axle widths for various models and had posted the codes for gear ratios. Three ratios is what I find GT4 Rear axle, 3.73 ratio GT5 Rear axle, 4.10 ratio GU6 Rear axle, 3.42 ratio __________________ Founding member of the too many projects, too little time and money club. My ongoing truck projects: 48 Chev 3100 that will run a 292 Six. 71 GMC 2500 that is getting a Cad 500 transplant. 77 C 30 dualie, 454, 4 speed with a 10 foot flatbed and hoist. It does the heavy work and hauls the projects around.