I recently changed the torque converter to a 2500-3000 stall, and the diff ratio from 3.07 to 3.46 on my 2005 Chevvy Lumina SS 5.7.
Rev limiter is set at 6500 and upshift rpm at 6300 on Power Mode in WOT, as before the mechanical changes. My tuner correctly put in the new values and it was saved and calculated before we loaded the new tune.
Now it hits the rev limiter, does not upshift, actually bounces to about 6700 rpm and only changes up when u lift your foot. This happens in the 2-3 and 3-4 upshift. I did not have the problem with the same upshift settings before changing the diff ratio and converter.
As I live some distance from my tuner, and his time is limited and this is rather frustrating, I would appreciate all the help I can get. Unfortunately, it is not possible to forward the tune.
Thanx guys.
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Easy vape