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Hey guys I was wondering if I were to do a gear swap, is there a way to adjust the speedometer to where it's accurate again? I was thinking of ditching my 3.55's and going for something around 3.90's or maybe even 4.10's. Also please take into consideration I have a 3.7L so if it's a programmer I'd have to use to adjust the speedometer, would it be compatible? Any info on this subject is greatly appretiated, thanks.
 

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gears won't affect the speedo, only tires size


welcome to the wonderful world of computerized trucks
 

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If it reads the speed off the ring gear in the differential (like my 2001 does) a gear change won't affect the speedo. The large ring gear turns one rotation for every tire rotation. Regardless of whether the pinion gear/driveshaft turns 3.55 times for every ring gear rotation or 4.10 or 4.56.
 
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