BUILDING
INSTALLATION GUIDES
Product-specific instructions, hardware notes, difficulty, install time and fitment details from OBS Billet University™.
PDF GUIDES • HARDWARE • FITMENT
OBS BILLET UNIVERSITY™
KNOW YOUR TRUCK.
BUILD IT RIGHT.
Practical GMT400 knowledge, fitment tools, install help, factory-code references and build resources for 1988–1999 Chevrolet and GMC OBS trucks.
RESOURCE LIBRARY
OBS KNOWLEDGE, ORGANIZED.
We’re building one place for the information owners actually need while restoring, maintaining and upgrading an OBS.
BUILDING
INSTALLATION VIDEOS
Quick visual walkthroughs for interior, exterior and engine-bay upgrades so you can see the install before you start.
VIDEO • TIPS • WALKTHROUGHS
COMING NEXT
FITMENT GUIDE
Year-by-year compatibility across C/K pickups, Suburban, Tahoe, Yukon, Blazer and Jimmy applications.
YEARS • MODELS • TRIM
RESEARCHING
EXTERIOR COLOR GUIDE
Factory exterior colors by model year, GM/WA paint codes and verified two-tone combinations as source data is confirmed.
PAINT CODES • COLORS • TWO-TONE
PLANNED
FACTORY CODES & RPO
A practical guide to common VIN, RPO, drivetrain, engine and trim codes found on GMT400 trucks.
VIN • RPO • DRIVETRAIN
PLANNED
TECH & SPECS
Useful dimensions, materials, fastener details, maintenance notes and technical references for common OBS projects.
DIMENSIONS • FASTENERS • SPECS
LIVE / EXPANDING
OBS ARTICLES & GUIDES
Educational OBS Billet articles organized around the information owners actually use while maintaining, restoring and upgrading GMT400 trucks.
FACTORY INFO
HOW-TO
FITMENT
TECH
RESTORATION
BUYING GUIDES
VIEW ARTICLES →
BUILT FOR THE OBS COMMUNITY
REAL INFORMATION.
REAL TRUCKS.
This library will keep growing as new guides, tools and verified factory information are added. The goal is simple: make useful OBS knowledge easier to find.
1988–1999
GMT400 FOCUS
CHEVY / GMC
TRUCK & SUV
OBS BILLET
UNIVERSITY™
