- 2006 GMC Sierra 1500 VIN 3GTEK14X76G257626 - Used GMC for sale from Guess MotorsGuess Ford Mercury by EveryCarListed.com Take a look at this 2006 GMC Sierra 1500 that just came into, Guess MotorsGuess Ford Mercury. This 2 Door Truck comes equipped with AMFM Stereo, CD Player and provides you with a sense of security with its safety features, including 4-Wheel ABS and more. We would love to talk to you more about this Sierra 1500. Please contact us for more information.