Has anybody done any tuning on a Hummer H2? I just started working on one and when I took it out for an initial test drive, I noticed that the shifting is extremely sloppy. It's almost as if each gear change is made in two stages and it literally takes 1-1/2 to 2 seconds for an upshift to take place. The shift takes noticeably more time to complete than in the Silverados/Sierras I've worked on. I'm just wondering if this is a normal H2 shift cal or if this particular vehicle has a trans problem.