Hello,
I'm new to HP Tuners. I did search this , but seems like I can't find a definite answer. I have a 57 Chevy with a 2004 GTO LS1/4L460 . We had the harness modified to eliminate the unnecessary and the PCM was flashed with some mods to the tune. At that time we didn't know what tire size or gear ratio we would be running. The tuner put 3.46 for the ratio and a different tire size than what we are running. I know how to modify this in the tune, but does this actually effect the transmission shift points etc? The Dakota Speedo is only off by about 2 mph. So no biggie there I just want to understand if I should correct these values or if it matters? I appreciate everyone's help.
Thank You
Matt