Originally Posted by Jays_SSZ28
If you have a solid WOT 2-3 shift then it's not the 3-4 clutches, it's the tuning.
Yeah, 2-3 shifts are firm as well as the 3-4 shifts, from part throttle to WOT. No "soft slippy shifts," no rev limiter banging then shifts. FIRM!
Are you saying that a bad tune can cause the TCC to slip? I don't get it. When the TCC is commanded, it would be at the 100% duty cycle lock because I tuned out the pulse width modulation feature on HPtuners to further reduce wear and tear on the TCC lock up plate in the torque converter.
In addition to this problem, TCC lock up seems to slip even more when I've been driving stop-and-go for more than 30 minutes in hot weather. Other than that, the slip is less pronounced, but still very noticeable when the motor and transmission are just warming up and at the minimum temperature for the ECM to command TCC lock up.