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Re: What's rear gear ratio are you running?
My 66 c10 that I bought last year came equipped with a 3:73 posi rear and a brutal sm420 tranny. I swapped the rear out for a 5 lug and rebuilt it with new 3:43 gears. It helped the screaming problem at 55 mph but after driving it around for a while now I think the sm420 has to take a hike. 1st is 7.06:1 2nd is 3.58:1 3rd is 1.71:1 and as you might guess 4th is 1:1. I've heard hardcore offroad rock crawlers love these ungodly low geard boxes but its unpleasant as a driver. 1st is so low its useless unless pulling out on a steep hill as it will get you to 3 or 4 mph before the engine detonates. I can pull out in 2nd very easily but I have to wind it way out because 3rd is so high. Was thinking a tremec or even a T5 out of a mid 80s to early 90s s10. Yea I know they were never built to take gobs of hp but I have no plan for that
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