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If any of you have shifting issues, try a full ECU/PCM reset first. (This wont fix worn out clutches)
The computer learns how to shift and sometimes glitches I suppose.
Just unplugging or taking it off power doesnt do the trick.

Cliff Notes:

• 2-3 and 3-4 shift flares, eventual full trans fail.
• Rebuilt tranny, 2-3 shift flare appears again.
• Found out about full ECU/PCM reset,
• Shift flares disappear, tranny shifts like a brand new car now.

When I bought this car in June 2020, it had a 2-3 shift flare. I changed fluid (it was black), changed shift solenoids, the flare reduced but never really went away. I think I changed the fluid like 3 times before the trans failed completely from the dreaded clogged filter. The clutches probably got obliterated by the shift flares.
I yank the tranny out and bring it to a rebuilder, got it back, toss it in, and after a couple drives, starts flaring again.
Im thinking, "This time it HAS to be the computer, its flaring the exact same way"
Im about to buy a junkyard computer.

My Mechanic said we should look for updates before changing computers.
Before trying updates, he gave me a sheet to try first.

1. Disconnect negative, then positive terminals
2. Install jumper wire between the terminals (For the full capacitor/memory discharge)
3. Turn ignition key to position II, leave for ten minutes. (Its ok, theres no power)
4. Turn key off, connect positive, then connect negative, start car and perform relearn procedure.

Right now, I drove all over the place trying to get it to flare, and it doesnt. Not once. It shifts like a brand new rental car. Ive never seen it shift like this in the year and a half Ive had it.
If you have any issues like this, I advise resetting the computer. This procedure seems like the ultimate reboot. Its an easy way to avoid the trans wearing itself out prematurely due to bad data commands. Were talking about 20 years of possible shift learning on the ECU/PCM. My car had 5 owners before me, Im sure they didnt baby it like I do.

Once again, my tranny is remanufactured, so everything is new. If your trans has completely worn out clutches, it could work better, but it likely wont fix slipping issues.

I will update if the flare comes back.

 
Rep Power: 366

thanks for info and feed back!
glad you solved your issues!