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Diff ratio in speedo cal - trans (TCM 5004)

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I will make one calibration change for an additional $100 per change. For example, changing a shift point for a given gear is $100 vs changing a shift point and a pressure setting would be $200. That value can be used towards the full custom tuning price.

 

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Mon, 08/07/2023 - 01:39
#1
dassaur
Diff ratio in speedo cal - trans (TCM 5004)

Fairly new to tuning but trying to learn!

I had my car tuned previously by a shop but I am tweaking it as I go. My car is a 2014 vf commodore with an L77 and 6l80e

My question relations to table TCM 5004 under the speedo calibration tab, since I've changed my diff from 2.92 to 3.27

The previous tuner set the ECM diff ratio (table 9050) to the new ratio, but left the trans ratio at 2.92.

I've searched in a few places but can't really get a clear answer as to whether this should also be changed or not. Thanks :)

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