when you say comp do you mean your computer?
if so, then no you dont.
All you need to do is change the speedometer gear in the trasnmission so the speedometer wont be as far off.
I'm not sure if they even make the correct speedo gear for AOD's with 4.10's, but one for 3.73's would get it close
the gear is plastic and will be about $15, and is easy to install.
good luck,
-Drew
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NMRA O/C 9516
NA pumpgas stickshift 347 10.65@125.6, 6.73@100, 1.41 60ft
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