1975 Pontiac Trans Am 455

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1975 Pontiac Trans Am 455

In 1974 the gas crunch was in full swing and peak of the muscle car era ended. Then Pontiac announced there would be a 1975 Trans Am with a 455 HO package. It included the 455 HO shaker hood, a 4-speed floor mounted manual trans with a 3.23 performance axle ratio, semi-metallic front disc brakes, and a specifically tuned exhaust system with twin exhaust splitters. Here's another full build Trans AM we're doing and in the process becoming Trans Am experts. Luke’s 1975 came to us as a nice, complete painted, running and driving car. Upon disassembly we found a bit of covered up rust and low quality repairs. Like most cars its age it had already seen some level of restoration but Luke is having us take it to the next level with a ground up, bare metal/new metal, Pro Touring custom build. Starting with a Schwartz G-Machine performance chassis and GM LT4 Supercharged motor with a Whipple supercharger in place of the stock unit - this bird is gonna fly!

    Frame and Suspension

    • Schwartz Performance bolt-in G-Machine Chassis
    • Ridetech single-adjustable coilovers
    • Power steering rack
    • Baer 14" 6-piston Pro Plus brake system w/rear floater kit


    • Chevrolet Performance Wet Sump LT4 crate engine
    • Upgraded camshaft, valvetrain & pulleys, Innovators West crank pulley
    • Whipple 2.9L supercharger
    • Chevrolet Performance LT4 controller kit w/harness & ECU
    • Drive Junky LT4 serpentine drive system
    • Methanol injection system
    • Estimated horsepower: 900hp at the crank


    • Chevrolet Performance 8L90e 8-speed automatic transmission
    • Chevrolet Performance Supermatic trans controller
    • Custom steel driveshaft
    • Moser full-floating 9" housing & 35 spline axles
    • Currie 9” iron third member, 35 spline axles, TrueTrac differential, 3.25 gear

    Wheels & Tires

    • Forgeline wheels TBD
    • Michelin Pilot Super Sport tires, 265/35/19 front, 345/30/19 rear

    Paint & Body

    • Paint color TBD
    • Filled marker lights front & rear
    • Fiberglass bumpers

    Other Features

    • Recaro Sport seats
    • BeCool 1000hp aluminum radiator module w/electric fans
    • Flaming River tilt steering column
    • Vintage Air Gen IV a/c system
    • Stainless EFI fuel tank with CTS-V pump & Vaporworx pickups
    • Optima YellowTop battery

      Arrival of Luke's 1975 Trans Am

      Disassembly gallery

      After chemical stripping. This is what we often find under "restorations"

      Chassis fabrication and installation gallery

      Sheet metal fabrication gallery

      Assembly before paint gallery