I just bought a new Acadia 2008. My Garage has an inclined ramp and everytime I need to come out in reverse, I have to accelerate my Acadia up to 3,000 rpm in order to start moving up. Transmission gearing seems to be OK, however, I have two more GMC (Equinox and Venture) and both of them start climbing at about 1,500 RPM or less. I took it to the local dealer and they upgraded the software with no changes. Has anyone experienced this same problem?