Originally Posted by
killerbee
If your goal is to maintain the same rpm for your shift points, then nothing needs to be done with a tire size change. If you are wanting to maintain the same torque at the shift point, given the longer radius, then you would increase the shift point rpm, and that could, in theory be easier on the drive train.
As a practical statement, not sure you will notice the change. However the GM factory shift and TCC schedule does have its shortcomings, with areas to be improved in all year groups. Especially the 6-speeds.