Thread: What is involved in changing the rear gears
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Old 06-09-2016, 02:38 PM
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17% drivetrain loss is usually what they use for the calculation with an IRS rearend.

I wouldn't bet on the 10% difference between the DynoJet and Mustang. Way too many variables to use that number. You are not even sure when the last time the dyno was calibrated. I called a shop to have my car done a few months ago and the guy said to me "It needs to be calibrated?" I guess that meant his 8 year old dyno had never been done. 491 rwhp is probably a pretty accurate number.
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