02-06-2012, 11:20 PM
I have a 07 Vmax Z71 4x4 with a custom tune. The speedlimiter is maxed, therefore it should do over the 95mph that it was restricted to from the factory. First try the rpm would stay steady at 4000rpms and it would go no faster. Took it back to my Guy and he changed one more thing. Now instead of staying steady it'll hit 100mph but starts jerking and Rome going up and down. Now its not a must as this is a daily driver and I rarely ever get over 80 but I'm curious as to what is still restricting the truck. Any ideas?