don't 4L80E's unock TCC for shifts? I've seen that in my logs. It'll go 1>2>3>LOCK>UNLOCK>4>LOCK ... annoying
It unlocks after the fact when it realizes what it just did, so 1>2>3>LOCK>4>UNLOCK>LOCK. I think I just need to have 3rd lock later or 4th upshift sooner so it doesn't get confused.
1998 GMC Sierra K1500 5.7/4L80E, longtubes, 411 w/COS 5, marine cam/intake, Whipple. 91 octane at 6000'.
1997 GMC Sierra K3500 7.4/4L80E, 411 w/COS 3, Whipple, small cam.
2004 Corvette Z06 with longtubes.