Gears & Axles - Want to change 3.25 gear to 3.73 or 4.10 (A4)
06-09-2012, 05:10 PM
So right now with a 9" running 3.25 gear with 315 35 17 MT Drag Radials. I am currently going through the lights @ 5500rpm. I dont want to go through any more than 6500rpm but not sure about what tire size to use with either gear to get that rpm.
06-09-2012, 09:22 PM
If you stayed with that tire size and went to a 3.73:1 ratio you would hit line at ~6300.
Simple way to calculate it: (Current rpm/current gear)*new gear = new rpm
06-10-2012, 09:29 PM
Any calculators for changing tire height also? Looking for a good combination.
06-10-2012, 09:40 PM
good luck, Johnny
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