This GMC Sierra 3500HD delivers a Gas V8 6.6L/ engine powering this Automatic transmission. UPFITTER SWITCH KIT, (5) Provides 3-30 amp and 2-20 amp configurable circuits to facilitate installation of aftermarket electrical accessories. Kit with all required parts will be shipped loose with the truck for installation by the dealer or upfitter at customer expense. Installation instructions and technical assistance available at www.gmupfitter.com., TRANSMISSION, 10-SPEED AUTOMATIC (STD), STERLING METALLIC.* This GMC Sierra 3500HD Features the Following Options *SLE CONVENIENCE PACKAGE includes (CJ2) dual climate control, (A2X) 10-way power driver seat including power lumbar, (N37) manual tilt/telescoping steering column and (T3U) LED fog lights; Single rear wheel models also include (U01) Roof Marker Lamps, REMOTE START PACKAGE includes (BTV) Remote Start, (UTJ) content theft alarm and (C49) rear-window defogger, LPO, HITCH PACKAGE Gooseneck ball and chain tiedown kit with case, (dealer-installed), GOOSENECK / 5TH WHEEL PREP PACKAGE -- Hitch platform to accept Gooseneck or 5th Wheel hitch. Includes hitch platform with tray to accept ball, stamped bed holes with removable caps installed and bed mounted 7-pin trailer harness (similar to UY2 harness). (Includes (CGN) Bedliner, Spray-on. , REAR AXLE, 3.73 RATIO, MIRRORS, OUTSIDE POWER-ADJUSTABLE VERTICAL TRAILERING WITH HEATED AND AUTO-DIMMING UPPER GLASS lower convex mirrors, turn signal indicators, puddle lamps, (U12) perimeter lighting, auxiliary lighting, power folding/manual extending (extends 3.31 84.25mm), Black Includes Perimeter Lighting and (DD8) auto-dimming rearview mirror.), GVWR, 11,700 LBS. (5307 KG) WITH SINGLE REAR WHEELS (STD), ENGINE, 6.6L V8 WITH DIRECT INJECTION AND VARIABLE VALVE TIMING, GASOLINE (401 hp 299 kW @ 5200 rpm, 464 lb-ft of torque 629 N-m @ 4000 rpm) (STD), Wireless phone projection for Apple CarPlay and Android Auto, Windows, power rear, express down (Not available on Regular Cab models.).