Originally Posted by bosco200
I have a 1972 C20 and I have 4.11 geairng in my rear end and the transmision is a 4 speed manual and the numbers are CH465. When I go on the interstate I go 65 and I am redling my truck already and was wondering if I would have to change the transmision gearing or the rear end gearing? It has a straight 6 in it but I have going to put a 350 V8 in it.
4th gear will always be 1 to 1 ratio in that trans, so nothing you can change with that.
Just change the gear ratio in the Differential.