My truck is rather sluggish. It has 3.42 gears. I am thinking of
putting in 4.56 to increase accelleration a bit. I don't want a race car,
but it would be nice to improve the pickup of my pickup (pun intended).
This site has a calculator based on your input of tire size, transmission
type(ratio) and tire diameter. It allows you to compare diffrent rears and
look at your road speed vs rpm. Depending at what speeds you normally travel
and the engines power band you can make your own decision.
I was referring to slippage causing 10-15% higher RPM.
The RPM that a lock-up converter drops is directly related to speed, amount
of power, weight, and RPM itself. Under little to no load, it might only
drop 10-20 RPM, under heavy throttle and heavy load, it con drop many
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