Drivetrain Advice?

[mxer201]

If the rear differential ratio in my 01 Navigator 2wd was changed from 3.73 to 3.08 or 3.31, what affect would it have on sensors, speedometer, anti-lock brakes, etc. ? Would it screw things up big time? Would a trip to a dealer be required to make adjustments to the computer program? Has anyone here ever done this? Not that I'm set on doing this but we hardly ever tow anything. And I know I should have considered the ratio before purchasing the vehicle. Just want to know what my options are.

[Regal292]

Yes you will need to go to the dealer to have them reprogram your computer. not a problem, I had to have that done because of the 24in wheels i put on mine. they just reprogrammed it in about 15 min. now all is fine and the speedos right on.

[03expyeb]

hmm. this thread looks familiar!! lol.