trans tuning.

[PsdPullerJr]

OK is it possible to leave the chip in one position and have the truck start in 2nd gear and get up to say 15 mph and shift into 3rd and stay there? Also possibly lock the TC at say 10 mph and unlock at the 2-3 shift? (Some power tracks or heavy sleds wont hold 3rd and a locked TC) How are the shifts points controlled on 4x4 low? The actual vehicle mph or is there a conversion factor? Thanks

[cleatus12r]

There are a lot of things going on there.....and quite frankly, depending on the year of the truck in question, may or may not work just the way you want it to. In either case, you are looking at a TON of trial and error with the tuning to make it work just right.

The 4x4 low shifts are handled the same as the high range shifts....only divided by 2.7.

[PsdPullerJr]

Well I got to hook on a real loose track thursday night. I tried playing with shift points to get the truck to start in 2nd which it did. I set it to shift into 3rd at 38 to 43 mph (Which should be appro. 14 to 16 mph in low range) and throttle postion around 3/4 to full pedal. However i was up around 20 to 21 mph on the speedo and 3200 rpm and full throttle and it never shifted to 3rd. Any thoughts? Something I may have missed like a delay or something else? Thanks Edit: Its a NVK4 truck with PMT1 programming

[F-127]

Any changes to the truck such as differential gear ratio or tires size? Might be enough of a change. WOT/WOT 4x4 shift rpms changed? Just some thoughts, I'm not on my computer with Minotaur or I might of had a few other ideas.