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1973–87 Squarebody C10 pickup chassis

13 aftermarket chassis and subframes from 7 builders, compared with keeping and upgrading the original frame.

Detroit Speed, GSI Machine & Fabrication, Porterbuilt, Roadster Shop, Schwartz Performance, Scott's Hotrods 'N Customs, Speedtech Performance

Aftermarket chassis

Prices checked Oct 2, 2026

Compare Builder & product Type Front Rear Price
Original chassis Keep it and upgrade itFull ladder frame (open C-channel rails) Factory Independent SLA with coil springs; Saginaw recirculating-ball box Solid axle on semi-elliptic leaf springs Kits from $4,754Cheapest kit in each area
Detroit Speed QuadraLink Rear Suspension Kit (041750/041751/041752) Rear suspension n/a 4-link coilover $3,714.95–$7,059.95 No brackets non-adj (041752DS) to weld-in brackets DA remote (041751-RDS) Source
Detroit Speed SpeedMAX Front Suspension System (032082 SBC / 032083 BBC) Suspension kit Tubular SLA arms, forged alum spindles, alum coilovers, GMT800-based rack, sway bar Not included $6,749.95–$8,738.95 Non-adjustable to double-adjustable shocks Source
Scott's Hotrods 'N Customs 1973-1980 SquareBody C10 Chassis Fits 1973-80 Chevrolet/GMC C10 (Squarebody) Full frame Scott's IFS, anti-dive, coilovers or air Equal-length parallel 4-bar, Moser 9in $14,750–$15,650 Coilover from $14,750; SuperSlam from $15,650 Source
Scott's Hotrods 'N Customs '81-'87 Square Body C10 Chassis Fits 1981-87 Chevrolet/GMC C10 (Squarebody) Full frame Scott's IFS, anti-dive, Aldan or air Equal-length parallel 4-bar, Moser 9in $14,750–$15,650 Coilover from $14,750; SuperSlam from $15,650 Source
Porterbuilt 1973-87 Chevy Truck Chassis, Level 3 Airbag Full frame PB Dropmember, airbag (bags not incl.) PB rear Dropmember, airbag $15,000 Chassis only; non-PB parts excluded Source
Roadster Shop 1973-87 C10 Slammed SPEC Full frame IFS, RS SV coilovers or air bags, power rack & pinion, forged knuckles with sealed bearing hubs Parallel 4-bar, coilovers or air bags, Ford 9in housing, 31-spline axles $15,495 Base price (starting configuration, before options) Source
Speedtech Performance 55-87 GM Truck Extreme Street Chassis Fits 1955-87 Chevrolet C10 / GM trucks Full frame Control arms, coilovers, rack steering Torque arm, 9in 31-spline $17,160 Listed price; plus $900 crating fee and freight Source
GSI Machine & Fabrication 73-87 Chevy & GMC C10 Squarebody Air Ride Chassis Full frame D2600 bags, boxed arms, Mustang II power rack 4-link, Firestone F9000 bags, billet Watts link, notch $18,500 Pre-order, quote required; includes axle housing, shocks, rack Source
GSI Machine & Fabrication 73-87 Chevy & GMC C10 Coilover Outboard / Inboard Chassis Full frame Coilover, boxed arms 4-link coilover $19,500 Pre-order; each version $19,500 Source
Roadster Shop 1973-87 C10 FAST TRACK Full frame RS Fast Track IFS, 58.75in track, C7-based forged knuckles, sealed hubs, RS SV by Fox coilovers, 1.25in splined sway bar Large-dia parallel 4-bar, Strange Ford 9in, S/S 31-spline axles; Fast Track IRS optional $22,495 Base $22,495; product page shows 'From $22,695' Source
Speedtech Performance 1973-1987 GM Truck Extreme Chassis (torque arm) Full frame Forged spindles, Sweet rack, coilovers Torque arm $24,999.95 Listed price Source
Speedtech Performance 1973-1987 GM Square Body Truck Extreme IRS Chassis Full frame Forged spindles, Sweet rack, QA1/JRi coilovers IRS, alum 9in, CV axles $33,902.96 Listed price Source
Schwartz Performance Squarebody G-Machine Chassis (1973-1987 Chevy C10 GMC) Full frame Double A-arm, power rack, HD splined sway bar Moser full-floating 9" (60" hub-to-hub); IRS optional Quote only Source
Tick up to 4 to compare side by side.

Reading these prices

Starting prices aren't always comparable. Some include suspension, steering and brakes; some are a bare frame or front clip and the rest is extra. Check the Front and Rear columns and each product's notes before comparing totals. "Price on request" means the builder quotes each build. Confirm with the builder before you order, and send corrections through our contact page.

Upgrade the original chassis

How it's built
Full ladder frame (open C-channel rails)
Front suspension
Independent SLA with coil springs; Saginaw recirculating-ball box
Rear suspension
Solid axle on semi-elliptic leaf springs
Weak spots
The C-channel rails flex, and the steering box mount area cracks. The leaf rear is harsh and loosely located, and the stance is tall.

Stiffening the body or frame? We list 2 kits for this car, such as frame rails, subframe connectors and braces, on its Chassis stiffening page.

Suspension and steering kits for the original chassis

AreaKitWhat it doesPrice
Front suspension Ridetech Complete Coil-over Suspension System, 1973-1987 C10 StrongArms, drop spindles, MuscleBar, bolt-on 4-link, HQ coilovers $7,320 Ridetech list Source
Front suspension Porterbuilt 1973-87 Chevy Pickup Front Dropmember, Level 2 Coilover DM7-7387-2-C Modular no-weld crossmember replacement with rack $1,549 PB Fab list Source
Rear suspension Ridetech Bolt-On 4-Link System, 1973-1987 C10 Replaces the leafs; C-notch plus R-Joint panhard, about 6in drop $2,750 Ridetech list; shocks extra Source
Steering CPP (Classic Performance Products) 500 Series Power Steering Box CP50014 14:1 box, direct bolt-on 67-87 (60-66 needs bracket) $455 CPP list Source