mikepike1125

so It will change shift points even though the truck has not been programmed to know it has the larger non stock rim on it? Does this add extra wear and tear on the tranny? Is it bad for the tranny?

My 4l60e went at 48,000 miles on my old 2002 silverado. Thanks GM!! I have a question. How does tire size affect the transmission? I had my stock 265 70 r17's on. For the summertime I swap to a 275 55 R20. I did some tire size calculations and it looks like there is not much of a difference between these two tire sets as far as circumference and diameter go. My speedometer reading with 20" wheels on is 1% too slow meaning that when my speedometer reads 60 mph with the 275 55 R20's on I am actually travelling 60.6mph. 638 revolutions per mile for the stock tire vs. 632 revolutions per mile for the non stock tire (275 55 R20). I meant to weigh a tire from each set to see the difference but of course I did not remember this intention until the tires were already on Anyways, how does this affect the transmission? I have the 6 speed auto.