The 2013 Sierra comes with a standard Vortec® 6.0L Variable Valve Timing V8 SFI E85-compatible engine, and an Allison™ 1000 series transmission. Sierra has a maximum conventional trailering capacity of 13,000 pounds, a maximum 5th wheel trailering capacity of 17,800 pounds, and a maximum payload of 4,212 pounds. The 2013 model has available additional cargo space with a 60/40-split folding rear seat. Safety features include StabiliTrak Stability Control System, OnStar Vehicle Diagnostics, Tire Pressure Monitoring System, six available air bags, and a steel reinforced safety cage.

The 2013 GMC Sierra 2500HD is available in four different trim styles: Work Truck, SLE, SLT, and Denali.

2013 Sierra 2500HD Work Truck (Regular Cab Long Box, Extended Cab Standard Box, Extended Cab Long Box, Crew Cab Standard Box, and Crew Cab Long Box)
• Vortec® 6.0L Variable Valve Timing V8 SFI E85-compatible engine
• StabiliTrak®
• Front split-bench seat
• Graphite-colored rubberized vinyl floor covering
• Single-zone manual air conditioning
• Cruise control
• Chrome grille surround
• Recovery hooks – front
• Front chrome bumper

2013 Sierra 2500HD SLE (Regular Cab Long Box, Extended Cab Standard Box, Extended Cab Long Box, Crew Cab Standard Box, and Crew Cab Long Box)
• Vortec® 6.0L Variable Valve Timing V8 SFI E85-compatible engine
• StabiliTrak®
• Front split-bench seat with lockable under seat storage
• CD/MP3 player
• Color-keyed carpet with rubberized vinyl floor mats
• Single-zone manual air conditioning
• Power windows
• Power door locks
• Cruise control
• Leather-wrapped steering wheel
• Recovery hooks – front
• Front chrome bumper
• Solar-Ray deep-tinted glass
• Outside heated power-adjustable, manual-folding Black mirrors

2013 Sierra 2500HD SLT (Extended Cab Standard Box, Extended Cab Long Box, Crew Cab Standard Box, and Crew Cab Long Box)
• Vortec® 6.0L Variable Valve Timing V8 SFI E85-compatible engine
• Heavy-duty automatic locking rear differential
• StabiliTrak®
• Front bucket seats
• Color-keyed carpet with rubberized vinyl floor mats
• Power windows
• Power door locks
• Cruise control
• Leather-wrapped steering wheel
• Dual-zone automatic air conditioning with climate control
• Recovery hooks – front
• Front chrome bumper
• Solar-Ray deep-tinted glass
• Outside heated power-adjustable, power folding mirrors

2013 Sierra 2500HD Denali
• SiriusXM Satellite Radio
• Bluetooth® for Phone
• Bose® premium speaker system
• Dual-zone automatic air conditioning with climate control
• Power-adjustable pedals
• Remote vehicle starter system
• Front bucket seats
• Heated and cooled front seats
• Heated, leather-wrapped steering wheel
• Rear Vision Camera
• 18" forged polished aluminum wheels