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I still can't believe your dealers can't adjust the stock tune for the gears! Did you guys get the gears installed somewhere else and then went to the dealer and asked them to add the gears to the stock tune? Maybe they're giving you a hard time because you didn't ask them to do the install. If the dealer did the install then I can't understand why they would install a part on a car that would change the speedo readings and not be able to fix it!
Dealer did mine too. Even sent me home without saying anything. Went back to have it done and they gave it back 5 mins later saying their system couldn't communicate with the vehicle.