[HUMMERcustoms.com/TAZ]

Tallo
You did good Buddy. The tranny should go a while with no problems. The real trick to making the trannies hold up is getting the line pressures up to prevent burned bands from slipping. It makes for a more firm shift but, even in a stock tranny if done in the beginning it will last longer. That was one of the reasons I got my hands on a programmer as fast as I could to up line pressures even though I was stock. I had seen it done on a Silverado and it made a big difference. It seemed to help transfer the HP and Torque to the ground better. The nice thing about 2005 & up, Hummer went to a 5 gear planetary versus the pre 2005 that had 4 gears. In 2005 and newer also with the 5 gear upgrade they used a better quality sun cage for the gears. It would help all the trannies if Hummer would cryo the sun cage and the gears.

The 2005 and newer have a few more tricks Hummer could use if they would.
They could put in a chromed hardened shaft which is really tough. There are many parts from a Vette tranny that will work in Our newer model trannies. I just want to recomend to all H2 owner's to get your line pressure up and most all handheld tuners can do this. It is normally called performance setting, firm, and then stock. Using the better servo's or the Vette servo will allow you to up pressure more.

I had a strictly Vette mechanic tell me I should go to a mechnical vacumm regulator like most all I think he said was in late 70's or early 80's. I need to talk to him more but, I think he said that in a SC setup You can hook the mechanical servo up and run vacumm hose up to the SC manifold and You then get more line pressure when the vacumm increases with depressing the throttle. He mentioned, if I understood, that it would do a better job than the computer controlled servo. I think he said it is going back to old school which I'm old enough to remember. The tranny in my 1968 Mustang was mechanical and I recall replacing it when the diaphrame inside split. This mechanic does it on Vette's and that way you do not get a more firm shift unless it is called for by engine. I do need to follow up on that unless someone knows better what I was recalling and can explain it. I would be grateful!!

I have had a health relapse and apologize for getting involved with this thread and not being able to stay with You through the diagnosis and solutions. You did a good job in working this out for Yourself with less knowledge and help. It goes back to an old saying that the only stupid question is the one you do not ask. You kept looking till You found someone that understood your need. Thanks for the info on a shop You found.

Congrats,

TAZ