Tech & How-To

Garage Knowledge

Practical GM enthusiast information organized by system and platform—repairs, upgrades, compatibility, troubleshooting and lessons learned from real projects.

Engine & Drivetrain

Powertrain combinations, maintenance, swaps, transmission considerations and supporting modifications.

Suspension & Brakes

Ride, handling, steering, brake upgrades and compatibility information by platform.

Electrical & Audio

Wiring, charging, diagnostics, car audio and lessons preserved from the original Lumina build.

Parts & Interchange

What fits, what changes by year, and where GM component sharing helps—or creates confusion.

FEATURED G-BODY TECH GUIDE

Chassis, suspension & interchange

A single cross-division reference for the hardware shared across Chevrolet, Pontiac, Buick, Oldsmobile and GMC G-body applications.

1978–1988 · BODY-ON-FRAME RWD

Understand the architecture before ordering parts.

Frame/body mounts, front and rear suspension, steering, brakes, rear axles, transmission crossmembers and a practical interchange matrix—plus Stage 0 inspection and street/handling/drag/restomod paths.

Open G-Body Chassis Guide →

Divisions5 GM branches

Core layoutFull frame · RWD

Rear4-link · coils

FocusFitment + upgrades

FEATURED TECH GUIDE

LS4 W-Body Guide

A cross-model technical resource for the Grand Prix GXP, Impala SS, Monte Carlo SS and LaCrosse Super.

5.3L V8 · TRANSVERSE FWD

The LS4 as a complete system.

Factory applications, unique packaging, transaxle integration, ownership checks, parts interchange and a sensible modification path—kept separate from the individual model histories.

Open LS4 Guide →

Applications4 W-body models

Factory output300–303 hp

Torque323 lb-ft

Era2005–2009

G-BODY UTILITY REFERENCE

GMC Caballero

The smaller GMC branch now has a dedicated model guide and Diablo appearance-package deep dive.

1978–1987

Caballero Guide

Architecture, chronology and shared El Camino hardware.

Open guide →SPORT APPEARANCE

Caballero Diablo

Graphics, trim and restoration-reference context.

Open deep dive →

G-BODY PONTIAC TECH

Grand Prix powertrains, chassis and swaps

The Pontiac branch now links factory Grand Prix history to the technical realities of GM-sourced engines, automatic transmissions and modern restomod planning.

1978–1987

Pontiac G-Body Powertrains & Tech

Engine-family context, transmission evolution, chassis commonality and swap planning.

Open tech guide →1986

Grand Prix 2+2

Aero-homologation hardware, source discrepancies and restoration checks for the rare Pontiac fastback.

Open 2+2 guide →

OLDSMOBILE G-BODY TECH

Hurst/Olds, 442 and VIN-9 307 reference

The Oldsmobile branch now separates the 1979 350-powered Hurst/Olds from the 1983–1987 high-output 307/200-4R era while keeping restoration and modification guidance in its own technical layer.

1979 · 1983–1984