Specifications Comparison: 2015 GMC Sierra 2500 vs 2021 GMC Sierra 2500

Seating Capacity

Trim	Engine	Seating Capacity
HD 2500 Crew Cab Denali	6.0L V8	5
HD 2500 Crew Cab Denali	6.0L V8	5
HD 2500 Crew Cab SLE	6.0L V8	6
HD 2500 Crew Cab SLE	6.0L V8	6
HD 2500 Crew Cab SLT	6.0L V8	6
HD 2500 Crew Cab SLT	6.0L V8	6
HD 2500 Crew Cab Work	6.0L V8	6
HD 2500 Crew Cab Work	6.0L V8	6
HD 2500 Extended Cab SLE	6.0L V8	6
HD 2500 Extended Cab SLE	6.0L V8	6
HD 2500 Extended Cab SLT	6.0L V8	6
HD 2500 Extended Cab SLT	6.0L V8	6
HD 2500 Extended Cab Work	6.0L V8	6
HD 2500 Extended Cab Work	6.0L V8	6
HD 2500 Regular Cab SLE	6.0L V8	3
HD 2500 Regular Cab SLE	6.0L V8	3
HD 2500 Regular Cab Work	6.0L V8	3
HD 2500 Regular Cab Work	6.0L V8	3

Trim	Engine	Seating Capacity	Doors
HD Crew Cab	6.6L V8	6	4
HD Crew Cab	6.6L V8	6	4
HD Crew Cab	6.6L V8	6	4
HD Crew Cab	6.6L V8	6	4
HD Crew Cab AT4	6.6L V8	5	4
HD Crew Cab AT4	6.6L V8	5	4
HD Crew Cab Denali	6.6L V8	5	4
HD Crew Cab Denali	6.6L V8	5	4
HD Crew Cab SLE	6.6L V8	6	4
HD Crew Cab SLE	6.6L V8	6	4
HD Crew Cab SLE	6.6L V8	6	4
HD Crew Cab SLE	6.6L V8	6	4
HD Crew Cab SLT	6.6L V8	6	4
HD Crew Cab SLT	6.6L V8	6	4
HD Crew Cab SLT	6.6L V8	6	4
HD Crew Cab SLT	6.6L V8	6	4
HD Extended Cab	6.6L V8	6	4
HD Extended Cab	6.6L V8	6	4
HD Extended Cab	6.6L V8	6	4
HD Extended Cab	6.6L V8	6	4
HD Extended Cab SLE	6.6L V8	6	4
HD Extended Cab SLE	6.6L V8	6	4
HD Extended Cab SLE	6.6L V8	6	4
HD Extended Cab SLE	6.6L V8	6	4
HD Extended Cab SLT	6.6L V8	6	4
HD Extended Cab SLT	6.6L V8	6	4
HD Extended Cab SLT	6.6L V8	6	4
HD Extended Cab SLT	6.6L V8	6	4
HD Regular Cab	6.6L V8	3	2
HD Regular Cab	6.6L V8	3	2
HD Regular Cab	6.6L V8	3	2
HD Regular Cab	6.6L V8	3	2
HD Regular Cab SLE	6.6L V8	3	2
HD Regular Cab SLE	6.6L V8	3	2
HD Regular Cab SLE	6.6L V8	3	2
HD Regular Cab SLE	6.6L V8	3	2