Just for those who want to know
Subject: Inventory Upgrade - Transfer Case Control Module Calibration Update #05559 - (08/31/2005)
Models: 2006 HUMMER H3
Condition
The Transfer Case Control Module (TCCM) Calibration has been revised to improve performance. The new calibration inhibits shifting in or out of 4 High lock at speeds above 45 MPH (72 KPH).