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Mod | | | Forums66 Topics128,069 Posts1,055,886 Members48,428 | | 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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For helping keep this great
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| | | | Joined: Feb 2016 Posts: 1,987 'Bolter | | 'Bolter Joined: Feb 2016 Posts: 1,987 | All of the responses are correct. Per the GM Heritage site, the high side 5-32 is 6.40 :1, the low ratio is 8.74 :1. I'm real happy with doner 2 speed that DougH6100 was able to part with, same ratios and a direct fit in my '57 LCF corporate axle. Before the transplant my truck would top out at 51 mph at 4000 rpm, now it can do 62 - 63 mph. It's pretty happy at 55- 60 mph around 3700 - 3800 rpm. Tire diameter will make a difference also, my drive tires are 10R-22.5, they are taller than the old 10.00-22.5 but I have not researched the diameter.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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