TPS 37% cruising along, accelerate slightly as soon as I touch 107 mph the transmission will drop to 5th for no apparent reason, at least I cannot find a reason in the tune. I am pulling my hair out trying to figure out WTF is going on with this.
In the log at 7:44:35 is where it downshifts.
One other thing, during 3-4 shifts at the beginning of the shift for a split second it feels like a trans brake is applied before it completes the shift.
Its really hard to see that in the log.
I have adjusted Oncoming & offgoing pressures, shift timing, shift scheduling every way I could and nothing seems to help. I was wondering with the "SuperMatic" could it be the "oncoming volume presets"? The SuperMatic is supposed to be more robust the a regular 6l80 as far as handling a higher torque input. So if there are added clutches to accomplish this then there would be less capacity for fluid. I'm just guessing at this point.
Hoping someone would be kind enough to take a look at my tune and log and possible find something I am missing.
Thanks in advance to anyone that takes the time to look.
1984 El Camino N/A 408 Iron-Block LS3 Terminator X Max SuperMatic 6L80