Can someone tell me what this TSB does?
 

03-07-30-007E MAY 08 A/T - Gear Engagement Time Characteristics
08-07-30-012 MAR 08 A/T - Clunk Noise First Gear/Engine Braking Sensation

I would like to know if anyone has the info in regards to this TSB??? I think this might be what is wrong with my truck.....

and how about this one? not sure if it applies to my H2:

01-07-30-042E MAY 07 A/T - 2-3 Upshift or 3-2 Downshift Clunk Noise

Re: Can someone tell me what this TSB does?
 

I bought a subscription to alldata, and found the issue. There is a revision of the original update that takes care of the clunk that I have been hearing. Here is the info:

Bulletin No.: 08-07-30-012

Date: March 13, 2008
Subject:
6L80 Automatic Transmission - Tip In Low Speed Clunk in First Gear When Throttle is Applied and Released, Engine Braking Sensation at Low Speeds (Reprogram TCM)

Models:
2008 HUMMER H2, H2 SUT

with 6L80 6-Speed Automatic Transmission (RPO MYC)

Condition

Some customers may comment that the vehicle has a "Tip In" low speed clunk in first gear when the throttle is applied and released in normal "D" drive. Other customers may comment on an engine braking sensation at low speeds in normal "D" drive.

Correction

A revised transmission calibration has been developed to address these issues. Reprogram the transmission control module (TCM) with updated calibration files using the TIS2WEB Service Programming System (SPS) application. As always make sure your Tech 2(R) is updated with the latest software version.

Warranty Information