Speedo calibration with 4.10's.QUICK!

[todd95GT]

Ok, I have an appointment to have 4.10's installed next week. I just called the shop to find out if the price included the speedo gear to get the speedo where it should be. The tech said that with 4.10's and a speedo gear, the clock will still be about 7-9 miles per hour high. AND, there's no way to get it right w/o pulling the tranny and tailshaft to swap tranny gears, and even then it won't be accurate. Obviously, I don't want that. Even with 3.73's, he said the speedo will still be 2-4 mph off even with the speedo gear. Now what? You guys have this problem? Another shop told me no problem and now I don't know which way to go. Who's telling me the truth?

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Todd
1995 GT/T-5
Pulleys; 65 mm TB; Flowmaster cat-back; Mac off road H-pipe; FMS aluminum driveshaft; short-throw shifter; HD clutch; Cobra R's; Cobra front and wing