I need some math help... I have 3.55s in my truck now with 275/55/R20s
I am changing to 4.10s to help out 1/4 mile times.. I was just wanting to get an idea of what the rpm would be at 60 and 70 mph.. I'm not sure how to figure
out how much difference the gear change will make..


Thanks, Tim

 

At 65 mph in OD you'll be at about 2000 rpm