« Reply #1 on: August 27, 2018 - 11:35:43 am »
You need to change the speedometer gear in the trans.
Type this into google mopar speedometer gear chart, many will pop up.
You need to know your rearend gears and your tire height.

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Current Mopar
70 Challenger RT 440-6 EFI, 73 Cuda 416-6 EFI
05 Hemi Durango, 01 Ram 4x4, 14 Ram 2500 4X4, 10 PCP Challenger 6 spd RT, 01 Viper GTS ACR, 52 B3B w/330 Desoto Hemi, 70 Hemi RR (under const)
Past Mopars
9 x Challengers. AAR Cuda, 4 RR, 2 GTX, 4 Chargers, etc... (too many to list)