GMC Sierra Heavy Duty 2nd Gen
The GMT800 Sierra HD is famous for introducing the powerful and reliable Duramax diesel and Allison transmission combination. Enthusiasts prize these trucks, particularly the 2006-2007 'LBZ' models, for their capability and pre-emissions simplicity.
Find one with Spotter →GMC Sierra Heavy Duty 2nd Gen sold for a median of $18,500 over the last 12 months, based on 37 auction sales; the middle 50% sold between $15,000 and $23,000. 222 currently for sale.
Listings
The second-generation GMC Sierra HD, built on the GMT800 platform from 2001-2007, marked a major step forward for GM's heavy-duty trucks. It introduced a much stiffer frame and, most importantly, the legendary 6.6L Duramax diesel engine paired with the robust Allison 1000 transmission. This powertrain combination proved to be exceptionally durable and capable, setting a new standard for the segment.
Collectors and enthusiasts specifically seek out these trucks for their blend of modern performance and relative simplicity. The 2006-2007 models with the "LBZ" Duramax are the most desirable, as they were the last versions produced before the implementation of more complex emissions systems like the Diesel Particulate Filter (DPF). Their reputation for reliability and tuning potential makes them highly prized.
The market for GMT800 Sierra HDs is strong and divided. High-mileage work trucks can be acquired cheaply, but well-preserved, low-mileage examples, especially LBZ-equipped Denali or SLT trims, often command prices rivaling much newer vehicles. With an average sale price over $22,000, these trucks have proven to be a solid investment for those who value pre-emissions diesel performance.
Buying Tips
- Check for rust on the rocker panels, cab corners, and frame, especially on trucks from northern climates.
- Early LB7 Duramax engines (2001-2004) are known for injector failures; look for proof of replacement or budget accordingly.
- The 2006-2007 'LBZ' Duramax models are the most sought-after and carry a significant price premium for their reliability and power.
- Test for worn front-end components like ball joints and tie rods, which are common wear items on these heavy trucks.
- Ensure the Allison transmission shifts smoothly and doesn't go into 'limp mode,' as repairs can be costly.
Based on 100 sales, prices range from $2,025 for well-used examples to $67,000 for top-spec, low-mileage trucks.
494 GMC Sierra Heavy Duty 2nd Gen vehicles have been tracked across auctions and listings on Hypercars, with 222 currently live.
Data sourced from Bring a Trailer, Cars & Bids, eBay Motors, PCarMarket, and Collecting Cars. Updated daily.
Frequently Asked Questions
How much does a GMC Sierra Heavy Duty 2nd Gen cost?
Over the last 12 months, GMC Sierra Heavy Duty 2nd Gen sold for a median of $18,500 across 37 auction sales tracked on Hypercars; the middle 50% sold between $15,000 and $23,000. There are 222 currently for sale.
How many GMC Sierra Heavy Duty 2nd Gen listings are for sale right now?
There are 222 GMC Sierra Heavy Duty 2nd Gen listings currently live across auctions, dealers, and marketplaces tracked by Hypercars.