2003 GT harsh 1-2 shift after 87 octane tune install

kimrpaige

New Member
Oct 26, 2015
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Hello All,
I am old school, LOL 65 yo and I have a tuner question. I just replaced my rear gears as I had a pinion bearing whine, so might as well wake the car up a bit with 4.10's. Anyway as you know to re-cal the speedo and shift points (auto). I have a SCT/Bama Xcal tuner. I installed the 87 octane tune at the same time. Now my 1-2 upshift is very harsh I would like to tame it a bit. I see that I can adjust shift some what by percentage, but not sure exactly what this does and how much if any that I should adjust. Can someone more knowledgeable in these tuners help me and give me some guidance. Thanks in advance
 
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