It's a good thing I have billet 4L80E internals, 1410 driveline parts and no passengers yet because my current setup will snap necks - not in a fun way. I can't seem to figure out why my trans is shifting so aggressively like the pressures are turned all the way up or something, despite my tune commanding less aggressive patterns than factory. It's an '03 Sierra 2500 light duty, 383 LS stroker, "1000hp" built 4L80E on solid axles and 37" tires. The transmission was built by a local speed shop to handle the life of the stroker, the weight of towing, and off-road fun, but I keep wondering if there's something inside the mechanical pieces of the transmission that is overriding my "softness" of the tune?
2 main issues I'm dealing with:
VE Tuning 2.0 spark tuning attempt 1 major changes.hpt
- 1st 2nd and 3rd gear upshifts feel like abrupt clutch dumps. very harsh. i feel like i'm going to break something sooner than later
- For some reason the MPH vs Throttle % is being "ignored". What I mean by that is if I command a 1>2 upshift at 15mph 37% throttle, it'll go to 20, 22, 25mph or more until I back off the throttle, and then it'll slam into 2 - for example. What am I missing on the requirements of a shift? Same thing happens in 2>3, and 3>4. Downshifts all seem fine for now.
Edit: Forgot to attach tune.