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Old 08-06-2013, 07:52 AM
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snrusnak snrusnak is offline
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Join Date: Jan 2011
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I'm not positive but I assume the 04 rams have the 545rfe, not the 45rfe. If that is correct, then based on the math:

If you had 3.55's with a 35" tire, at 70mph you'd be turning 1598 rpms in the 6th gear
If you had 3.92's with a 35" tire, at 70mph you'd be turning 1765 rpms in the 6th gear

The superchips is able to correct for gear ratio. Do you have it corrected for tire size currently?

You can also request your build sheet from chrysler and it will have your differential ratio.
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