Quote:
Originally Posted by 69l46vert
Thanks OrrieG, I tried one of the calculators and 4.10's at 2000 rpm with 31" tires gives 45 mph so I see what you mean. Not great for highway speeds. I really don't think I want anything larger than 31's either. Rick
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4.10 is the "correct ratio" for 31" tires to get the
best overall performance potential out of your engine assuming you are properly cammed (not too big) and have the the right stall (about 2200-2400) to match your cam.
The following chart assumes 1:1 ratio at 65 MPH
At 65 mph you will make 2890 RPM at 1:1, and with 0.7 OD ratio that drops to 2023 RPM. This configuration of tire and gear has been pretty much standard with Toyota in the pickup and 4runner line for a long time.
If you want to drop to 3.73 gears, you will likely not get the best 4x4 experience but it will be 10% more highway friendly. 3.42 will be 20% lower than 4.10 and not optimal for a 4x4.