Three-piece hydroformed frame, LS-based V-8s, Autoride & Quadrasteer options.
The first‑gen Avalanche is a Swiss‑army truck: Suburban comfort, Silverado capability, and the unique Midgate that stretches the bed from 5.3 ft to 8.1 ft in under a minute. This article catalogs every engine, trim, axle ratio, transfer case, model‑year change, and the common issues shoppers ask about. Fast Facts GMT800 Chevrolet Avalanche 1500 Trim […]
The GMT800 Chevrolet Suburban 2500 is the heavy‑duty long‑wheelbase SUV built for towing and payload. Compared with the Suban 1500, it adds 8‑lug running gear, bigger brakes with Hydro‑Boost, heavy‑duty transmissions, larger fuel capacity, and available big‑block power. Quick Specs (at a glance) GMT800 Chevrolet Suburban 2500 (2000–2006) Deep Dive Trims & Seating Year(s) Trims […]
Why it matters: On the GMT800 platform, the Suburban 1500 paired the long 130‑inch wheelbase with a 5.3L Vortec V8, 4‑speed automatic, and either 2WD or Autotrac 4×4. A rare 2006 LTZ special edition added a 6.0L V8 and full‑time AWD. For families, towing, and long‑haul reliability, this is the long‑body benchmark of the era. […]
The GMT800 Chevrolet Tahoe is 2‑row, full‑size, body‑on‑frame SUV built for the 2000–2006 model years (succeeded by the GMT900 for 2007). All 1500‑series Tahoes used small‑block V8s and the 4L60‑E automatic; 4×4 models primarily used the NP8 AutoTrac transfer case. Wheelbase is 116.0 in and this generation offered LS, LT and Z71 trims, plus Police/SSV […]
Scope: This article covers the heavy‑duty variants of the GMT800 Chevrolet Silverado 2500HD and 3500 built for the 2001–2007 (Classic) model years. They use the GMT880 platform. We will focus on trims, engines, transmissions, transfer cases, axles/gearing, year‑by‑year differences, and widely reported issues (no fixes), with citations to factory literature and trusted technical sources. Quick […]
The GMT800 GMC Sierra 1500HD sits in a unique spot in the GMT800 lineup: think of it as a ¾‑ton‑lite built on the light‑duty cab/box, but with 8‑lug hardware, 8,600‑lb GVWR, the 6.0L LQ4 V8, and the heavy‑duty 4L80‑E automatic. It was crew‑cab only with the standard (6.5‑ft) box, in SLE or SLT trim, offered […]
The first-generation GMT800 Chevrolet Silverado 1500 and 1500HD spans the 1999–2006 model years, plus 2007 “Classic” carryover trucks. The conventional Silverado 1500 is the light-duty half-ton. The Silverado 1500HD is a substantially heavier Crew Cab derivative with an 8,600-lb GVWR, a 6.0L V8, a 4L80-E automatic transmission, eight-lug running gear, and greater payload capacity. GMT800 […]
The GMT800 platform replaced the GMT400 in 1999 (for 2000 model year light-duty pickups) and brought major updates in engineering, safety, and refinement. With an all-new frame, updated Vortec engines, improved crash protection, and expanded trim and luxury offerings, GMT800 became the backbone of GM’s full-size truck and SUV lineup through the early 2000s. It […]
The GMT800 platform (model years 1999–2006 for GM full-size trucks and SUVs) is well-regarded for durability, but these vehicles do have a number of common problems buyers and owners should be aware of. In this guide, we focus exclusively on GMT800 models – including the Chevrolet Silverado, Tahoe, Suburban, Avalanche; GMC Sierra, Yukon, Yukon XL; […]
This comprehensive checklist covers the GMT800-platform GM full-size SUVs: Chevrolet Tahoe & Suburban (2000–2006), GMC Yukon & Yukon XL (2000–2006), and Cadillac Escalade (2002–2006, including EXT truck and ESV). (Note: 2007 models were the next-generation GMT900, so 2000–06 (and any “2007 Classic” carryovers) are included here.) The GMT800 SUVs share many components and common issues, […]
