GM Squarebody Technical Directory & Semantic Sitemap
Explore every engineering solver, factory specification repository, and documentation node across the Squarebody technical hub. Designed for both human automotive restorers and autonomous search crawlers.
Core Engineering Tools & Interactive Solvers
4 Primary ToolsGM Squarebody Truck Technical Specifications Hub
Complete 1973–1987 third-generation C/K platform overview, factory engine specs, differential guide, and model year trim matrix.
Universal 1973–1987 GM Truck VIN & SPID RPO Code Decoder
Interactive 13-digit and 17-digit ISO VIN parser, SPID glove box RPO code reference, engine suffix decoder, and plant matrix.
Squarebody Transmission Specs & Drivetrain RPM Simulator
Cruising RPM calculator across TH350, TH400, 700R4, and SM465. Factory gear ratios, fluid capacities, and torque specs.
Squarebody Electrical Diagrams, Color Codes & Circuit Pinouts
Interactive firewall bulkhead circuit explorer, factory GM color codes, HEI ignition wiring, and dual tank switching schematics.
Factory Specifications & Verification Documents
3 DocumentsAutomotive Engineering Methodology & Verification Standards
Primary source verification protocols, GM Factory Service Manual archives (X-7832/X-8632), and mathematical derivations.
Privacy Policy & Zero-Tracking Mechanical Standards
Zero-tracking disclosure, GDPR/CCPA client-side calculation privacy declaration, and absence of third-party telemetry.
XML Semantic Index Sitemap
Machine-readable XML sitemap index adhering to Google Search Console and Bing Webmaster protocol standards.
Platform & Powertrain Technical Coverage Index
34 Canonical EntitiesSquarebodyTech documents the full mechanical landscape of third-generation GM C/K trucks, including factory vehicle series, transmission options, engine platforms, differential hardware, and electrical circuits:
Chassis & Body Styles
- Chevrolet C10 (1/2-Ton 2WD Pickup)
- GMC K10 (1/2-Ton 4WD Pickup)
- C20 3/4-Ton (Heavy Duty 2WD Chassis)
- K20 4WD (Three-Quarter Ton 4x4)
- C30 1-Ton (One-Ton Commercial Chassis)
- K30 Dually (One-Ton Dual Rear Wheel 4WD)
- K5 Blazer (Full-Size Utility 4x4)
- GMC Jimmy (Full-Size Utility 4x4)
- Chevy Suburban (Carryall Station Wagon)
Transmissions & Overdrives
- TH350 Automatic (3-Speed Light/Medium Duty)
- TH400 Heavy Duty (3-Speed Extreme Duty)
- 700R4 Overdrive (4-Speed Automatic Overdrive)
- SM465 Granny Low (4-Speed Heavy Duty Manual)
- NV3500 5-Speed (Modern 5-Speed Manual Swap)
- NV4500 Heavy Duty (5-Speed Manual with 5.61:1 Low)
Factory Engine Families
- Small Block Chevy 350 (5.7L V8 4-Barrel)
- Big Block Chevy 454 (7.4L High Torque V8)
- 305ci V8 (5.0L Small Block V8)
- 250ci Inline-6 (4.1L Reliable Workhorse I-6)
- 6.2L Detroit Diesel (Naturally Aspirated V8 Diesel)
- Quadrajet Carburetor (4MV Spread-Bore)
- Holley Sniper EFI (Modern Throttle Body EFI)
Drivetrain, Axles & Electrical
- SPID Decal (Service Parts Identification)
- 13-Digit VIN (1973–1980 Door Pillar Format)
- 17-Digit VIN (1981–1987 Windshield ISO Format)
- G80 Gov-Lok (Mechanical Locking Differential)
- GM 10-Bolt Axle (8.5-inch Half-Ton Differential)
- GM 12-Bolt Axle (8.875-inch Performance Axle)
- GM 14-Bolt Full Floater (10.5-inch Heavy Duty Axle)
- NP203 Transfer Case (Full-Time 4WD Cast Iron Case)
- NP205 Transfer Case (Gear-Driven Part-Time 4WD Case)
- NP208 Transfer Case (Aluminum Chain-Driven 4WD Case)
- HEI Electronic Ignition (High Energy Ignition)
- Firewall Bulkhead Connector (Central Chassis Harness Pinout)
Topical Engineering & Calculation Architecture Roadmap
Multi-phase expansion pipeline modeling all statutory, thermodynamic, and mechanical dependencies.
Core Sizing & Foundational Architecture
Primary real-time simulators, dimensional blueprints, and electrical/spatial tolerances.
Advanced Electrical & Sub-System Synthesis
DC-DC charging curves, alternator heat dissipation matrices, and solar MPPT efficiency models.
Environmental & Thermal Dynamics
R-value condensation envelopes, psychrometric heating loads, and passive ventilation airflow models.
Plumbing, Fluid Mechanics & Greywater Loops
PEX piping friction loss calculations, 12V diaphragm pump pressure drops, and freeze-risk mitigation.
Chassis Weight Distribution & Axle Equilibrium
Center of gravity (CoG) 3D coordinate modeling, GVWR compliance, and suspension deflection ratios.