im going to order the 4.10 gearing from americanmuscle but idk how to fix the speedometer. I herd it will throw it off do i also need to get a speedcal or what
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yep, if you have a tuner you can fix it with that, or if you don't have one you are gonna need to get something such as a Dallas SpeedCal

 

aww that sux, hey what are ur quarter mile times hany
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The tuners work the best for this. And they are the easiest.

As for the MPH, you'll be about 12-14 miles too fast on the speedo with the 4:10's and stock diameter wheels/tires.

Oh, but the newfound fun! Muuuuhahahahaha...