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  1. K

    Benefits to tuning a stock GT?

    The speedcal part is incorrect.. I have a 98 GT and i just did my rear end gears and the the tuners only fix the speedo problem for 99's and up. You will still need to by a speedcal after you install rearend gears.
  2. K

    Help! Speedo Problem

    Thanks for all the help guys.. Decided to go with the speedcal only because its supose to be more accurate and i dont need any speeding tickets and my millage on the odometer going up...
  3. K

    Help! Speedo Problem

    I thought the predetor could too but i guess the speedo only goes electronic with the computer at 99 and up. At least thats what the people at Diablo told me when i called them all ticked off.. So the speedo cal will make it 100 percent accuarate? I got a quote from a speedo shop for 250 to...
  4. K

    Help! Speedo Problem

    Hi guys.. Im New to the board. I have a 98 GT B&M Short Throw, Flow Masters American Thunder Catback, BBK H Pipe, Cold Air intake, and a Diablo Predetor Tunner. I Just recently rebuild the rear end and put pro 5.0's 3:90's in the rear end. Now my speedo is all screwed up and they dont make a...
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