1966–77 Early Bronco chassis

5 aftermarket chassis and subframes from 4 builders, compared with keeping and upgrading the original frame.

BADASS Broncos, Patriot Classic 4x4, Roadster Shop, Throttle Down Kustoms

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Aftermarket chassis

Prices checked Oct 2, 2026

Builder & product	Type	Front	Rear	Price
Original chassis Keep it and upgrade itFull ladder frame (C-channel rails, short 92in wheelbase)	Factory	Solid Dana 30/44 axle on coil springs with radius arms and track bar; manual box (power optional from 1973)	Solid 9in (early Dana 44) on leaf springs	Kits from $6,369.83Cheapest kit in each area
Throttle Down Kustoms 1966-1977 Ford Bronco Coilover Helix Frame	Full frame	Coilover-ready frame (suspension not detailed)	Not detailed	$6,999 From $6,999; bare frame, options added Source
Patriot Classic 4x4 Early Bronco Chassis Coilover 1966-1977	Full frame	Ford 9in front, 4-link + panhard, Fox 2.0 Perf Elite coilovers, JK knuckles	Ford 9in, 4-link + panhard, Fox coilovers	$33,995 Sale price (reg. $34,495); assembled chassis with axles, Wilwood brakes, Borgeson box Source
Roadster Shop 1966-76 Bronco RS4	Full frame	Solid axle: Currie Dana 44, triangulated 4-link, Fox 2.5 coilovers, 10in travel	Solid axle: Currie Dana 60, triangulated 4-link, Fox 2.5, 12in travel	$44,995 Base price (starting configuration, before options) Source
BADASS Broncos BADASS Broncos Gen-1 Chassis	Full frame	Custom coilover, Fox 2.5 Performance, 10in travel	Fox coilovers, Truetrac	$52,000 Starting at $52,000 MSRP; includes steering, Wilwood brakes, driveshafts, 25-gal tank Source
Roadster Shop 1966-77 Bronco RS4R	Full frame	IFS, fabricated upper/lower control arms, 59.625in width, chromoly spindles, 300M shafts; High 9 PRO Iron diff, Tru Trac	Fabricated triangulated trailing arm (4-link), High 9 PRO Iron with Tru Trac, 4.86 gears	$80,995 Base price (starting configuration, before options) 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 (C-channel rails, short 92in wheelbase)
Front suspension: Solid Dana 30/44 axle on coil springs with radius arms and track bar; manual box (power optional from 1973)
Rear suspension: Solid 9in (early Dana 44) on leaf springs
Weak spots: The steering box mount and frame horns crack. Radius-arm bushings and the track bar allow wander, and the stock box and drag link are vague, with bump steer when lifted.

Stiffening the body or frame? We list 1 kit for this car, such as frame rails, subframe connectors and braces, on its Chassis stiffening page.

Suspension and steering kits for the original chassis

Area	Kit	What it does	Price
Front suspension	Wild Horses 4x4 Early Bronco 2.5in Suspension Lift Kit (WH Nitro shocks)	Front coils, 14-piece bushings, rear 8-leaf packs, shocks, U-bolts	$1,054.90 Wild Horses list Source
Front suspension	TOMS OFFROAD 66-77 Bronco 2.5in Suspension Lift Kit - Level 3 K6945	Matched coil/leaf lift package	$1,287.95 Starting price on TOMS category page Source
Rear suspension	TOMS OFFROAD Rear Triangulated 4-Link Conversion Kit for Coil-Over Shocks	Replaces the rear leafs; needs a 2in+ body lift and fabrication	$3,994.95 TOMS list; coilovers not included Source
Steering	Wild Horses 4x4 Master Power Steering Conversion Kit w/Pulleys NET1962	Quick-ratio box, pump, hoses, billet pulleys, collapsible shaft	$1,319.98 Wild Horses list Source
Steering	James Duff Power Steering Conversion Kit, 1966-77 Bronco	Power box conversion for 289/302/351W Broncos	See source Price not readable (JS page) Source