Switching gears - long 4th gear

[SCRubicon23]

If I had an automatic, and if I had a Tazer, I would play with the tire size parameter and the rear end gear ratio parameter to see if I could get the JT to shift where I wanted.

I have the Flashcal and have already adjusted the tire size. Don’t know enough about the gear ratio to mess with that. Would probably mess something up.

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[LostWoods]

If I had an automatic, and if I had a Tazer, I would play with the tire size parameter and the rear end gear ratio parameter to see if I could get the JT to shift where I wanted.

The problem is that the patterns aren't anywhere near linear with all the various inputs -they're a several-dimensional map. The crappy shifting without reprogramming is because the computer can't figure out what is going on; the truck isn't behaving as is expected given the inputs. By reprogramming, you correct the tire input and the controller's calculations work more accurately.