Light-duty GMT400 pickups—small-block V-8s, IFS 4×4, 4L60-E/80-E autos.
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 […]
This is a deep dive reference‑grade breakdown of the GMT400 GMC Sierra 1500 including trims, engines, transmissions, 4×4 systems, axles/gearing, chassis/brakes, capacities, year‑by‑year changes, spec tables by model year, common owner‑reported issues (no fixes), and fast factual Q&A. Quick tools:• Decode your build: GM RPO Code Decoder• VIN, recalls & TSBs: GM VIN Decoder + […]
Chevrolet’s 454 SS is the poster child of the GMT400 “OBS” era: a regular‑cab, short‑bed C1500 stuffed with a throttle‑body–injected 7.4L big‑block and built to cruise Main Street. Launched for 1990 and produced through 1993, it started with a 230‑hp/385‑lb‑ft 454 and TH400 3‑speed/3.73 gears, then leveled up for 1991–1993 with 255 hp/405 lb‑ft, the […]
The GMT400 Chevrolet C/K 2500 is the sweet spot of the OBS era—more muscle than a 1500, less bulk than a 3500. Sold from 1988–1998 (plus 1999 “Classic”), it came in two flavors: the 2500 Light Duty (~7,200‑lb GVWR, 6‑lug, 14‑bolt 9.5″ semi‑float) and the 2500 Heavy Duty (8,600‑lb GVWR, 8‑lug, 14‑bolt 10.5″ full‑float). You’ll […]
Platform/Program: GMT400 (fourth‑gen C/K). Coverage here is Chevrolet C/K 1500 light‑duty pickups (OBS) across model years 1988–1998, plus 1999 “Classic.” This guide focuses on the half‑ton (1500) line and the specialty 454 SS where relevant. Fast facts (at a glance) Reference backbone for generations/engines/chassis/airbags/third‑door timing: Chevrolet C/K (fourth gen) overview and model‑history sections. Wikipedia GMT400 […]
