Had the gears swapped out in my 96 GT to 3.73 the day after I bought it. I knew going into it that my speedo was going to be off due to the 3.73 gears. I was looking online and it says that some mustangs you can buy a tuner and correct the speedo and some you need a new gear in the trans. How do I tell what I have? Anybody know what part I need if I need a new gear in the trans or what tuner works the best. Thanks in advance for any help.