1st off I have a 07 Chevy 2500Hd with 6.0 Vortex and 6L80 Tranny. Now with that being said. When driving the shift pattern was irotic, hard shifting sometimes, then soft shifting others. If you push the Tow Haul button shifts are completley crazy. Driving down the road at highway speeds (55-65mph) the truck shifts from lock up to unlock and back and forth. Every once in awhile it would loose its mind and throw trouble codes lock down in "limp Mode" After 2 times of this I replaced the TCM and had the dealer program it. Now shifts are great, but still in and out of lock up at highway speeds, with tow haul on shifts are harsh and high rpm's before finally falling in gear. Also now if coming in from a coast in 6th gear(OD) it seems to false neutral and grind into a gear. Has anyone had any problems like this? Any info would be greatly appreicated.