First modern full-size GM frame; C/K pickups, Tahoe/Yukon & Suburban ruled the 90s.
GMT455 platform overview. The GMT455 Chevrolet/GMC C3500HD was GM’s purpose‑built Class 4 (15,000‑lb GVWR) chassis‑cab that bridged light‑ and medium‑duty trucks. If you’re shopping, decoding, or documenting one, this guide pulls together engines and transmissions by year, axles and gearing, chassis hardware, dimensions/capacities, model‑year changes, and the “gotchas” owners report most often. From the factory […]
The GMT400 Cadillac Escalade (1999–2000) is Cadillac’s first SUV—mechanically a luxury‑trim K1500/Yukon Denali with the 5.7L Vortec, AutoTrac 4×4, and the full leather/wood treatment. If you’re shopping, documenting, or decoding one, this guide compiles trims, powertrain pairings, transfer‑case behavior, axles/gearing, year‑by‑year differences, specs, RPO codes worth knowing, and commonly reported issues. Use our GM RPO […]
The GMT400 GMC Yukon Denali ran just two model years (’99–’00) as GMC’s short-run flagship before the GMT800 era. It wrapped the proven 5.7L Vortec/4L60‑E driveline in a luxury package: monochrome exterior, wood/leather interior, Bose audio with rear controls, heated front and rear outboard seats, and AutoTrac push‑button 4×4. If you’re shopping, restoring, or decoding […]
The GMT400 GMC Yukon GT is the monochrome, two‑door sport variant of the first‑gen Yukon—sold from 1993–1997 and built on the same short‑wheelbase chassis as the Tahoe/2‑door Suburban. Think of it as the “factory sport pack”: body‑color grille/bumpers, Yukon GT rocker decals, bucket seats with a full console, and (most trucks) 4×4. Early models used the […]
The GMT400 GMC Yukon 4 Door arrived for 1995 as the shorter, more maneuverable sibling to the Suburban, then bowed out after 1999 when GMT800 replaced the platform. This guide compiles trims, engines and transmissions, 4×4 systems (including AutoTrac), axles and gearing, specs by model year, year‑to‑year changes, and the most commonly reported issues—so shoppers […]
The GMT400 GMC Yukon 2 Door distilled full‑size SUV capability into a shorter, lighter package that’s now a 1990s icon. This guide compiles trims, engines and transmissions, 4×4 hardware and transfer cases, axle ratios, dimensions, towing, year‑by‑year changes, and specs by model year—plus a concise list of commonly reported issues and quick owner FAQs. Use […]
The GMT400 GMC Suburban 2500 is the heavy‑duty, ¾‑ton version of the iconic full‑size SUV—built to tow, haul, and rack up miles. This guide compiles trims, engines and transmissions, 4×4 hardware, axle ratios, capacities, year‑by‑year changes, and specs by model year, plus a quick list of commonly reported issues and owner FAQs. Where exact equipment […]
The GMT400 GMC Suburban 1500 is the last GMC-badged Suburban before the name transitioned to Yukon XL for 2000. Built 1992–1999 (with some late‑’99 overlap against the GMT800s), this half‑ton “C/K‑based” SUV delivered nine‑passenger space, truck‑grade towing, and the durability of GM’s small‑block V8s. This guide compiles trims, engines and transmissions, 4×4 hardware, axles and […]
The GMT400 GMC Sierra 3500 is the one‑ton backbone of GM’s OBS era—offered in single‑rear‑wheel (SRW) and dual‑rear‑wheel (DRW “Big Dooley”) configurations across Regular, Extended, and Crew Cab bodies. This guide separates what matters for buyers and researchers: SRW vs DRW hardware, 7.4L gas and 6.5L Turbo‑Diesel powertrains, 4L80‑E/NV4500 pairings, 4×4 transfer cases, full‑float 14‑bolt […]
The GMT400 GMC Sierra 2500 is the OBS era’s three‑quarter‑ton workhorse—sold from 1988–1998 (plus 1999 “Classic”) in two distinct flavors: 2500 LD (6‑lug, ~7,200‑lb GVWR, 9.5″ semi‑float) and 2500 HD (8‑lug, ~8,600‑lb GVWR, 10.5″ full‑float). Whether you’re eyeing a Vortec‑era 5.7 L31 or 7.4 L29, a 6.5 Turbo Diesel, 4L60‑E/4L80‑E automatics or NV4500 manual, part‑time 4×4 or […]
