gears

[trx88]

need to see what size your tires are and what mph you want to know the rpms will be at..
well the final overdrive ratio on a 4l60e is .70
miles per hour times .70 times gear ratio times 336 then divide by your tire height

(mph)x(.70)x(4.10)x(336)/(35)=rpm

example..

60mph x.70x 4.10 x 336= answer then divide answer by / 35= 1653

thats 60 mph with 35 inch tires at a 4.10 ratio

 

[98chevy4x4]

Thanks man thats exactly what i plan on getting but i might get 36's but i did the whole formula and with 36's the rpms are lower why is that