Thread: 3.91 gear talk
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Old 11-07-2019, 09:17 PM   #37
Drives: Chevy Camaro SS, Chevy Corvette,
Join Date: Aug 2019
Location: Illinois
Posts: 86
Originally Posted by camguynj View Post
fyi... a tune updates the ECU count which CAN NOT EVER be reset even if you reload the stock tune. The count will be checked for a power train warranty claim and if it's more than one your claim will be rejected. When a dealer does a speedo recalibrate they will (and only they can) register the recalibrate/ECU update with GM to preserve your power train warranty
I am getting a set of 3.91 gears for my SS and Shop foreman told me they will recalibrate the Speedo.

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