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I doubt it. https://www.sonnax.com/tech_resources/106-4l60e-flares-on-2-3-shift-could-be-a-bad-computer

You don't repair it, you change the pcm typically. I'm sure it could be repaired if someone wanted to take the time. But it's not worth it imo

Well you nailed it. PCM was hanging the solenoid release. I actually changed the trans again and had the exact same symptom before I found it. The logic was commanding the shift, but the quad driver wasn't shutting off the solenoid cleanly.!!!!!

I did check the line pressure and it was in spec. Yes it's a stock ls1. The pcm would command the shift but it took 3 seconds after the command at light throttle to actually shift. I just finished rebuilding a good core to put in the car so I will find out if the pcm drivers are the issue. If...

2000 Camaro Z28

clinebarger do you think the worn pin bore could cause the no 2-3 at wot?

I recently did a stock rebuild on a 4l60e that came in with a failed band and 3-4 clutches. I tested all the usual suspects, and replaced the 3rd accumulator check ball. With everything installed to spec I installed the unit to find no 2-3 shift at wot, and delayed 2-3 shift at part throttle...

Particularly at wot. Pulled it back out, clearances are still in spec. Before I pulled it I put another 3rd accumulator capsule in it and swapped the valve body with no difference.