Very violent 2-3 shift flares after transmission builds. Happens on every unit so far
I've got a trans builder doing our transmissions that's been building GM transmissions for 40 years. Very experienced and reputable, but I am not so sure he knows what he's doing on 6L80's anymore. The last 6 units I've had him build all have a very nasty shift flare on the 2-3 that WAS NOT there before, and lots of uncomfortable clunking while downshifting coming to a stop. Also occasional 4-5 shift flares. A couple of these have been pulled and taken back for inspection only for the problem to show up again. I'll repeat, these cars did NOT have these issues before and I had the trans tuning dialed in quite nicely. The builds were done to hold more power.
So far I've played with shift times, shift intertia factor, TQ management, etc to no avail. Nothing changes it. Anyone have any experience with this and know a way to smooth it out without having to do tear downs all over again? We're using PATC parts throughout.
Thanks