Quote:
Originally Posted by Chance
You may be correct if Ford now measures speed directly off wheels, like by using the ABS sensors or something similar. On older models they took speed off transmission shaft that measured driveshaft speed. In those cases changing the rear gear ratio required speedometer recalibration.
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After thinking about this a bit: you do need to recalibrate the computer for the new gear ratio (and different rpm levels.). The computer won't be seeing the proper rpms for the speeds that it sees, and it WILL throw codes...
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