The 2019 GMC Sierra 3500HD is available as a 4-door, 5-seat regular side. Starting at $41,600, the 2019 GMC Sierra 3500HD Base 4x2 Long Box Dual Rear Wheel is powered by a 6.0L , 8 -cylinder engine mated to an automatic transmission that returns an EPA estimated The top of the line 2019GMCSierra 3500HDDenali 4x4 Short Box , priced at $ 59,900 , is powered by a 6.0L , 8 - cylinder engine mated to an automatic transmission that returns an EPA estimated