Sitting in the parking lot of Family Chevrolet in Laredo. Got ready to leave Zapata, Tx on Falcon Lake this morning, headed to Ft. Worth, and I couldn't get my pushbuttons on the dash to work on my 2004 Z71 to shift the transfer case to neutral. There are a lot of TSB's on the subject. The speedo also went to 45mph sitting still and 120 barley moving. I tried removing and replacing the 30amp TREC fuse under the hood to "wake up" the control unit to no avail, so I gave up. Cranked her up, put it in neutral, and drove 50 miles north to Laredo. There are two speed sensors and a wiring loom that may be corrupted so I'm awaiting my verdict.