well i have a diablo tuner already, its just not a In-Tune one.
i can still do a customized one with diablew... i just dont feel its the right time just yet.
after new headers and exhaust would be a good time.
i do agree i think the tranny is a weak point. i have thought about moving up to a 6 sp when this one finally goes out. my current one is still working very good.. so who knows...
like i tell anyone who listens.. i will run this H2 in to the ground, and then rebuild it with a different engine and do it again.
my personal opinion is:
the H2 gets crappy MPG.. throw a big block in there and give it a real excuse to get crappy MPG. im thinking a 454 or a 502 BB engine.
one a happy note... i just hit 9.9 MPG yesterday on my average mpg

i was at 8.8 with the 4.10 gears.. it is slowly climbing with the 4.88's.
stock before any mods when i drove it off the dealers lot it showed 11.4 mpg average.
so im happy to be close to double digits with all the mods i have listed in my sig.
i dont drive my H2 like a pavement pricess though.. i stomp the pedal, and normal cruising is about 80 MPH for me. i like to get where im going fast, but in style.
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2003 Black Hummer H2 Adventure Package
4.88 gears
*** Cognito UCA & SwayBar Links
*** Kryptonite tie rods
*** K&N CAI
*** 37x12.50xR20 BFG KM2 Mud Terrain's
*** 20x10 Black KMC Rockstars
*** EBC Slotted Rotors
*** N-FAB Sidesteps
*** Line-X Grill
*** Recon Smoke Cab Lights
***Diablo Predator U7193