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I've done some research and seen that the speedometer on the 1998 Mark Viii is read from the front wheel. If I got from the factory rear gear to the LSC 3.27, do I need to get a tune/chip for it to shift correctly? I don't want to go any bigger than 3.27 and trying to save money so I don't...

Hey guys, recently purchased a 98 Mark VIII almost mint with 41k miles. It's an awesome car, and the previous owner swapped out the air ride with the supercoupe suspension. Anyways, the heat works fine in the car but when you put the fan speed to a low setting, it doesn't blow out as hot no...