i have a 2003 h2. I bought it with the gears flaring (reving between shifts) No error codes. I replaced it with a rebuilt transmission, and same problem with flaring. I brought back the 2nd transmission they gave me another built transmission... installed it today and SAME PROBLEM! it revs between gears, (but shifts smoothly, after reving up 1000rpm obo).

I replaced the PCM, got it programmed at the dealer (all pins are perfect on the pcm)

What can cause this problem?