Hey there! I have a 2002 Bluebird bus with a Kodiak 7500 8.1 liter engine. I have added some speed tunes to the bus to get it above 45mph however I am having some shifting issues:
1) Shift from 1st gear to 2nd gear doesn't happen until close near 3,300 rpm. Very high.
2) when shifting from 2nd gear to 1st gear it jerks very hard. believe also because it is still a high RPM.
I have lowered the RPM values for the transmission but still getting the same results. I have attached the tune file along with the drive recording. Any help would be very much appreciated before I head out on a trip tomorrow.3-21-24 shift points.hpt3-21-24 test ride.hplBus.jpg