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EARLY FORD BRONCO
SUSPENSION SYSTEMS
Benefits of a James Duff Suspension System:
Why a complete
package is better...
 These systems
are the best available because they are designed so all
of the components work together to improve ride and handling
under varying conditions. Our suspensions keep in mind
the daily driver and full-time four-wheeler; Someone who
wants to ride comfortably and safely both on the street
and on the trail. We only offer lifts up to 3 1/2", due
to practical limits on driveline angles and vehicle roll
center. Designs are based on a Bronco Hardtop with a 302
engine. Less weight (from a 6 cylinder or no top) or more weight
(from engine swaps, winches, heavy bumpers, etc.) will
affect the amount of lift. Our budget oriented systems
use add-a-leafs for the rear end rather than blocks. Inspect
your leaf springs for sagging, cracks or daylight between
leafs before ordering. Add-a-leafs will not make up for
tired or cracked leafs. Upgrading to a new leaf spring
pack system may be necessary.
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SYSTEM B: Basic 3.5" Suspension
Basic Street & Trail System for you on a budget.
3.5" Progressive
Rate Coils, 6.25° 14 piece Bushing Kit, Large
Add-a-leafs, Tracking Bar Drop Bracket, U-Bolts, 4 Shocks & Boots
#5000B System B:66-75 Bronco, $459.00
#5001B System B:76-77 Bronco, $459.00
*Upgrade this system to the improved ride and travel of our leaf springs. System B+ substitutes new leaf packs for the add-a-leafs. Specify Medium Duty or Heavy Duty
System 5000B+ 66-75 $899.00
System 5001B+ 76-77 $899.00
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Add Double Shocks to the Basic system for
Better Performance and Handling. |
SYSTEM D: Bronco 3.5" Deluxe Suspension
Adds Classic Double Shocks to the Basic System for
Better Performance and Handling.
3.5" Progressive
Rate Coils, 6.25° 14 Piece Bushing Kit, Large Add-a-leafs,
Tracking Bar Drop Bracket, U-bolts, Front & Rear Double Shock Mounts, 8 Shocks & boots
#5000D System D:66-75 Bronco, $709.00
#5001D System D:76-77 Bronco, $709.00
*Upgrade this system to the improved ride and travel of our leaf
springs. System D+ substitutes new leaf packs for the add-a-leafs.
Specify Medium Duty or Heavy Duty
System 5000D+ 66-75 $1150.00
System 5001D+ 76-77 $1150.00
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Adds Original Front Dual Shock Hoops to the
Basic System for more Travel. |
SYSTEM F: Bronco 3.5" Hoop Suspension
Adds Original Dual Shock Hoops to the Basic System
for increased travel
3.5" Progressive Rate Coils, Stage 1 Original Hoop Mounts, Classic Rear Double Shock Mounts, 6.25° 14 Piece Bushing Kit,
Large Add-a-leafs, Tracking Bar Drop Brackets, U-bolts, 8 Shocks & Boots
#5000F System F:66-75 Bronco, $859.00
#5001F System F:76-77 Bronco, $859.00
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 The Ultimate Suspension
The Ultimate systems incorporate all the best features from our other suspensions and carry it one step further with the addition of ten or eleven leaf soft ride springs. Along with zinc plated Original Dual Shock Hoops and our progressive rate coils, these springs will provide excellent articulation without a body lift or major structural modifications. Articulation and comfort... the best of both worlds!
SYSTEM G: 3.5" Ultimate Suspension
3.5" Progressive Rate Coils, 6.25° 14 piece Bushing Kit, 11 Leaf Soft Ride Springs, Tracking Bar Drop Bracket, U-bolts, Original Dual Shock Hoops, Rear Double Shock Mounts, 8 Shocks, Urethane Shackle Bushings
#5000G - MD System G:66-75 Bronco, $1275.00
#5001G - MD System G:76-77 Bronco, $1275.00
#5000G- HDSystem G:66-75 Bronco, $1275.00
#5001G - HD System G:76-77 Bronco, $1275.00
SYSTEM K 5.5" Ultimate Suspension
5.5" Progressive Rate Coils, 7° 14 piece Bushing Kit, 11 Leaf Soft Ride Springs, Heavy Duty Tracking Bar Drop Bracket, Adjustable Radius Arm Drop Brackets, U-bolts, Original Shock Hoops, Rear Double Shock Mounts, 8 Shocks, Urethane Shackle Bushings.
#5000K-MD System K: 66-75 Bronco, Medium Duty Leafs, $1675.00
#5001K-MD System K: 76-77 Bronco, Medium Duty Leaf, $1675.00
#5000K-HD System K: 66-75 Bronco, Heavy Duty Leafs, $1675.00
#5001K-HD System K: 76-77 Bronco, Heavy Duty Leafs, $1675.00
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Long Travel Suspension System
The Long Travel systems are the Ultimate Suspensions with our Stage
2 Long Travel Shock Hoops, Stage 2 Rear Shock Mounts, and Long
Travel Shocks. These shock mounts are designed to be used with
at least a 2” body lift. The mounts allow you to take full
advantage of the travel our springs are capable of. These systems
will provide excellent articulation along with a comfortable ride
on and off-road. Better articulation and still comfortable...the
best of both worlds!
SYSTEM J: 3.5” Long Travel Suspension
3.5” Progressive Rate Coils, 6.25° 14 piece Bushing Kit,
11 Leaf Soft Ride Springs, Tracking Bar Drop Bracket, U-bolts,
Stage 2 Long Travel Shock Hoops, Stage 2 Rear Shock Mounts, 4-8120
Long Travel Shocks, 4-8114 Shocks, Urethane Shackle Bushings. *At least
a 2” body lift required.
#5000J - MD System J: 66-75 Bronco, 11 Leaf, $1495.00
#5001J - MD System J: 76-77 Bronco, 11 Leaf, $1495.00
#5000J - HDSystem J: 66-75 Bronco, 11 Leaf, $1495.00
#5001J - HD System J: 76-77 Bronco, 11 Leaf, $1495.00
SYSTEM L: 5.5" Stage 2 Suspension
5.5" Progressive Rate Coils, 7° 14 piece Bushing Kit, 11 Leaf Soft Ride Springs, Heavy Duty Tracking Bar Drop Bracket, U-bolts, Adjustable Radius Arm Drop Brackets Stage 2 Long Travel Shock Hoops, Stage 2 Rear Shock Mounts, 4-8120 Long Travel Shocks, 4-8114 Shocks, Urethane Shackle Bushings. *At least a 2” body lift required.
#5000L-MD System L: 66-75 Bronco, Medium Duty Leafs, $1895.00
#5001L-MD System L: 76-77 Bronco, Medium Duty Leafs, $1895.00
#5000L-HD System L: 66-75 Bronco, Heavy Duty Leafs, $1895.00
#5001L-HD System L: 76-77 Bronco, Heavy Duty Leafs, $1895.00
“Monster” Suspensions
These systems take our Ultimate and Long Travel Bronco Suspension all the way with the addition of our Stage 3 Radius Arms, Extended Length Brake Hoses, E-brake cables, a Heavy Duty Bump Stop kit and a Drop Pitman Arm.
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SYSTEM M: 5.5" Monster Suspension
5.5" Progressive Rate Coils, 7° 14 piece Bushing Kit, 11 Leaf Springs, Stage 3 Radius Arms, HD Track Bar Drop Bracket, U-bolts, Stage 2 Shock Hoops, Stage 2 Rear Shock Mounts, 4-8120 Long Travel Shocks, 4-8114 Shocks, Shackle Bushings. *At least a 2” body lift required. |
#5000M-MD System M: 66-75 Bronco, Medium Duty Leafs, $2395.00
#5001M-MD System M: 76-77 Bronco, Medium Duty Leafs, $2395.00
#5000M-HD System M: 66-75 Bronco, Heavy Duty Leafs, $2395.00
#5001M-HD System M: 76-77 Bronco, Heavy Duty Leafs, $2395.00
SYSTEM P: 5.5" Monster Suspension - for vehicles without a body lift
5.5" Progressive Rate Coils, 7° 14 piece Bushing Kit, 11 Leaf Springs, Stage 3 Radius Arms, HD Track Bar Drop Bracket, U-bolts, Original Stage 1 Shock Hoops, Stage 1 Rear Shock Mounts, 8-8114 Shocks, Shackle Bushings, Brake hoses, E-brake cables, HD Bump stops and a Drop pitman arm.
#5000P-MD System P: 66-75 Bronco, Medium Duty Leafs, $2395.00
#5001P-MD System P: 76-77 Bronco, Medium Duty Leafs, $2395.00
#5000P-HD System P: 66-75 Bronco, Heavy Duty Leafs, $2395.00
#5001P-HD System P: 76-77 Bronco, Heavy Duty Leafs, $2395.00
SYSTEM R: 3.5” Monster Suspension
3.5” Progressive Rate Coils, 6° 14 piece Bushing Kit, 11 Leaf Springs, Stage 3 Radius Arms, HD Track Bar Drop Bracket, U-bolts, Stage 2 Shock Hoops, Stage 2 Rear Shock Mounts, 4-8120 Long Travel Shocks, 4-8114 Shocks, Shackle Bushings. *At least a 2” body lift required.
#5000R-MD - System R: 66-75 Bronco, Medium Duty Leafs, $2395.00
#5001R-MD - System R: 76-77 Bronco, Medium Duty Leafs, $2395.00
#5000R-HD - System R: 66-75 Bronco, Heavy Duty Leafs, $2395.00
#5001R-HD - System R: 76-77 Bronco, Heavy Duty Leafs, $2395.00
SYSTEM S: 3.5” Monster Suspension for vehicles without body lift
3.5” Progressive Rate Coils, 6° 14 piece Bushing Kit, 11 Leaf Springs, Stage 3 Radius Arms, HD Track Bar Drop Bracket, U-bolts, Original Stage 1 Shock Hoops, Stage 1 Rear Shock Mounts, 8-8115 Shocks, Shackle Bushings, Brake hoses, E-brake cables, HD Bump stops and a Drop pitman arm.
# 5000S-MD - System S: 66-75 Bronco, Medium Duty Leafs $2395.00
# 5001S-MD - System S: 76-77 Bronco, Medium Duty Leafs $2395.00
# 5000S-HD - System S: 66-75 Bronco, Heavy Duty Leafs $2395.00
# 5001S-HD - System S: 76-77 Bronco, Heavy Duty Leafs $2395.00
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Stage 4-Link Suspension
What is a Four Link Suspension and why do I need one?
Traction. The dual triangulated design keeps the tires on the ground- where you want them! Much like adding traction bars to a leaf spring suspension, the upper and lower links locate the axle but allow it to travel up and down and articulate without side to side and axle wrapping motion. This puts all your power to the wheels along with the added bonusses of an amazingly smooth ride, reduced u-joint failure and an improved departure angle.
Stage 4-Link Rear Suspensions
Our four link systems are for the Bronco enthusiast who wants to take their rig to the next level- but without all the fuss! Our High Clearance, Dual Triangulated design comes with everything needed for a High Articulation Early Bronco four link.
•Axle mounts are made easy with our weld on truss assembly. Includes upper and lower link attachments, shock mounts, coil cup & seat mounts all custom laser cut and engineered for extra strength. Our new heavy duty lower coil retainers keep your springs held tight under full droop.
•Frame brackets can be welded where you want them, allowing you to stretch your wheelbase up to 2” without crossmember modification.
•Lower links are made with the same huge 2” OD .313” wall DOM tube as our Radius Arms, tough enough to take any abuse from trail obstacles. Blue powdercoated and finished off with left and right hand threaded 1” rod ends for easy adjustment.
•Upper links are blue powdercoated 1 1/2” OD .120 wall DOM with left and right hand threaded 3/4” Rod ends for adjustment for varying lift heights.
•Blue power coated Progressive Coil Springs give approximately 5 1/2” of lift (depending on weight of/or vehicle setup). Our exclusive zinc plated weld on Coil Buckets can be installed to achieve different ride heights.
•Zinc plated shock mount crossmember has two inboard and two outboard shock mounts, creating a more stable ride with less body roll.
Includes;4 Duff shocks and lower shock mounts. No cutting into the body (only minor trimming of wheel well lip) needed with 2” body lift.
A REAL Complete Bronco specific system ready to deliver amazing articulation and offroad stability. Welding required. Exhaust modifications likely, may require relocating a brake hose bracket or e-brake cable. We do not recommend these kits for vehicles that are driven regularly on the road or at high speeds as the softer suspension can cause excessive body roll in a panic situation.
#5360 Stage 4-Link Rear Suspension, $1,495.00
#5360 DIY 4-Link Suspension**, $995.00
#5000T System T: Monster System with 4-Link, 66-75, $2995.00
#5001T System T: Monster System with 4-Link, 76-77, $2995.00
One Ton Stage 4-Link Suspension
Our One-Ton 4 Link Suspensions fit Sterling 10 1/4, 14 Bolt and Dana 60 & 70. The contents and specifications are all the same as our 9” kits with the exception of the axle housing truss. The One ton systems utilizes a Heavy Duty 1/2” Plate Steel one piece truss that bolts to the appropriate heavy duty diff guard to prevent spinning the axle tubes. Upper link mounts are made of 3/8” plate in a low profile design for maximum clearance. Dana 70HD will require some modification.
#5370 4-Link Suspension for One-Ton, specify diff, $1,695.00
#5370 DIY** 4-Link Suspension, specify diff, $1195.00
#5000V System V: Monster System & One Ton 4-Link, 66-75, $2995.00
#5001V System V: Monster System & FW 4-Link, 76-77, $2995.00
All prices includes diff guard.
#5371-10 Diff Guard for Sterling 10 1/4
#5371-14 Diff Guard for 14 Bolt
#5371-67 Diff Guard for Dana 60-70
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6609 Bronco Dr., Knoxville, TN 37921
Phone: 1-865-938-6696
7am-3pm M-F West Coast
10am-6pm M-F East Coast |
Fax: 1-865-938-6746
24 Hours |
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