Right now my truck has a 4:56 gear ratio and I can't go over 40 with out it screaming at me. Looking for something more like a 3:08 ratio. Not having any luck finding a ring and pinion for this old rear end. I do not want to put a whole new rear end in the truck with leaf springs and all that. I'm trying to keep it as original as possible except of course the gear ratio. Any help would be very appreciated. Like I said in the subject line it is a 1962 Chevrolet C20 Pick Up, 4spd on the floor and RWD, it has the 261 Inline 6 cylinder in it. Thanks for your help guys!!
hmm...i am taking your truck has the eaton rear end???there are several versions.. i think there is at least ONE different ratio for the EATON rear end.. my cousin did that with his 62/63 chevy C20 coil spring rear end.you can also go to a taller rear tire.. a family truck came with 8.75-16.5 and 4.56 gears.. and was horrible..if you have my sister went out and purchased some new rims and tires.. went to a impossible to find 10.5/x 30.5 over the 27 inch tall 8.75 versions.. made a HUGE difference..i went to the 33 inch tall 235/85-16 on my van verses the 9.5-16.5 tires that were on it.. because you probably have 16.5 rims.. and i could be wrong.. you might just want to borrow a set of 32 to 34 inch tall tires from a much later GM truck or van and see how that changes your RPM range.. be sure to use your GPS for speedometer offset calculation.. nascar suppliers have axle housing brackets to use the swing arms on other rear ends..
there may be a hand full of 3:90 gear sets for these.. but they seem to be over 400 bucks..might be easier to find an overdrive transmission ... there are a some OEM 5 speeds available..my contact on these has closed their doors after 60 years ... look at the NV4500 in this image