Do I Have to Calibrate Speedo Again after Regearing to 4:10?

[ggrjordan]

Just like the question above. Is it necessary to recalibrate the speedometer again even if I already did for 3.73 gears and 245/75/16 mud tires? All I added was the 4:10 gears.

Can it be that the car thinks I still have 3.73 gears in? I want to get all the benefits of regearing and even though I do noticed the difference, it’s kinda slight, almost the same as before. I have to mention that the overdrive off button doesn’t work as smooth as when I had the old gears but was calibrated. Other than that everything is powerful and no complaints. What do you guys think? I’ve been regeared for 2 years now, only calibrated with 3.73 gears and 245/75/16 tires, though.

Thanks.

Jeep Liberty Kj 2002 limited 4wd
245/75/16 Mud tires
4:10 gears

 

[Ian Glass]

Your speedo and odo will be out. Best to get hold of a Garmin watch or Garmin GPS device and find a clear bit of highway. Then drive at all the speeds that you need - say 30, 40, 50 and 55MPH. Also record the odo distance covered and compare that to the GPS distance. Then without going through an expensive calibration process you can make a correction chart for indicated speed vs actual speed. The GPS device will also give you indicated odo vs actual miles covered - useful for calculating actual gas milage! Good luck - it's fun.