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08-16-2005, 09:16 PM #1
- Join Date
- Nov 2004
Tuners: What tune changes are needed when installing 4.10s in a car with a 4r70w?
When I get 4.10 gears installed in my 04 GT/auto, what tune changes are necessary?
I know I have to recalibrate the speedometer with my DiabloSport Predator but how does that affect other things like shift points? I know that the part throttle shift points are based on Throttle Position and MPH. With taller gears, it should shift sooner but how does the PCM know to do this? Do the part throttle shift point tables get scaled accordingly by the Predator?
I also remember reading about lowering the WOT shift points because the RPMs climb faster with taller gears. Is this true? How much lower should the WOT shift points go?
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