GMT400
Verified working Aug 19, 2026
A focused forum for maintaining and modifying 1988–1998 GM trucks.
GMT400 is a community forum centered on GM’s 1988–1998 C/K trucks, Suburbans, Tahoes, and related OBS-era builds. Members discuss maintenance, engine and transmission issues, suspension setups, towing, off-road modifications, interiors, electronics, bodywork, and project build threads.
Why it stands out
- Narrowly focused on the GMT400 generation rather than all GM trucks.
- Large archive of thread-based troubleshooting, with many sections showing tens of thousands of messages.
- Separates street/track and lifted/off-road workflows, making build advice easier to route.
- Dedicated build-thread areas let members document projects without general discussion clutter.
- Covers both stock maintenance and custom fabrication, from OEM interiors to cages and suspension work.
Good to know
- Most useful for 1988–1998 GM truck platforms; owners of other generations may find only partial overlap.
- Advice is community-generated and should be verified against service manuals or professional diagnosis for safety-critical repairs.
- Some participation features require registration, and the site warns that JavaScript is needed for the best experience.
- Forum threads can contain older, conflicting, or anecdotal information, so date and context matter.
Under the radar: When asking about suspension or build direction, choose the Street and Track or Lifted and Offroad side first; similar parts and problems are split between those areas, so posting in the right branch can surface more relevant past threads.
Photos
Owners of 1988–1998 GM trucks who need model-specific repair help, upgrade advice, or build feedback from other enthusiasts. Troubleshoot engine, HVAC, brake, transmission, wiring, or transfer-case problems. Research suspension options for lowered, lifted, bagged, or off-road builds. Follow long-running member build threads for ideas and real-world part combinations. Share photos, videos, towing reports, trail experiences, or street/strip results.
Categorized discussion boards for street, track, lifted, off-road, interior, electronics, paint/body, towing, audio, photos, and build threads. Includes subforums for Vortec performance, LS/carb swaps, exhaust, and wiring diagrams, plus forum search, new-post views, member registration, and browser app installation support.
Alternative listings
An archive of vintage vehicle manuals, brochures, ads, and specs.
AutomotiveThe Old Car Manual Project collects digitized automotive documents for older cars, trucks, engines, and related components. Its holdings include service manuals, carburetor and chassis references, model specifications, brochures, press photos, and period advertising, presented for historical and educational use.
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Similar sites elsewhere
- GM-Trucks.com — gm-trucks.com
- FullsizeChevy — fullsizechevy.com
- SilveradoSierra.com — silveradosierra.com
- The Truck Stop — thetruckstop.us
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