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I know what you mean. I thought about commenting that the calculator is based on a true 49" tire diameter (14.00x20) but that doesn't take into account tire squat. Then I figured I might be splitting hairs. [EDIT: I could subtract a couple of inches off the numbers to compensate but it's...

Okay, I did NOT account for the transfer case ratios. I assumed it was 1:1 high. I found an old thread by mangus580 where he posts the t-case ratios. http://www.steelsoldiers.com/showthread.php?28620-5-Ton&highlight=5+ton This brings the RPMs down to more believable levels. I was...

Bumping an old thread in case anybody else is curious like me. :) I found the following ratios. I don't know if these are the actual ratios. ( MT654 vs MT654CR?) http://www.vibratesoftware.com/html_help/2011/Allison/allison_5speed_auto_trans.htm#MT%20654CR 1st - 4.17 2nd - 2.21 3rd - 1.66...