2001-2010 Duramax 4.5" Coilover Lift Kit (BDS740FDSC)
If you've got an HD Duramax truck it's possible it could use some new suspension! Why not lift it while you're in there with this BDS 4.5" Coilover conversion system. This system eliminates your torsion bars and gives you a much more adjustable alternative. This system builds on the BDS high clearance system design offering more ground clearance, corrects suspension, steer, driveline geometry, and pairs it with the race-proven pedigree of Fox 2.5 factory series Coilovers to soak up the harshest terrain while still offering comfort and control for your daily commute.
Tire & Wheel Combinations:
- 33" x 12.50" w/16 x 8 and 4-1/2" back spacing
- 35" x 12.50" w/17 or 18 x 9 and 5.5" back spacing
- 35" x 12.50" w/20 x 9 and 5.75" back spacing
Notes:
- Torsion Bar Tool required to load/unload the torsion bars
- Some welding required
- Requires frame bracket modification and differential mount modification
- Traction bars will not fit standard cab/short box models and are designed to work on vehicles with 4" to 8" of lift
- 20" wheels with 5" to 5.75" backspacing is recommended for reduced trimming
- Narrow track knuckle will slightly increase the turning radius
- For tail high stance use #119157 add-a-leaf with the block kit or #069207 with leaf spring kit
- Not Recommended for Suburban / Yukon models with AutoTrac Transfer Case
- Does NOT work with rear Autoride equipped SUV's
- Fits Diesel Models Only
Installation:
- Click Here For Installation Instructions
- Difficulty: 4 (where 1 = easiest and 5 = complicated)
Part Number: BDS740FDSC

Fox 2.5 Remote Reservoir Coilovers w/ DSC
These race-proven FOX 2.5 remote reservoir coilovers up the ante allowing for next-level damper capability and control all neatly packaged. Designed for bolt-on installation, the engineers at BDS and FOX teamed up to offer this race-winning technology into a bolt-on, pre-tuned Coilover designed to perform and provide correct ride height right out of the box. From valving to spring rate, preload, and hose length these FOX coilovers are designed to take all the guesswork out of setting your vehicle up and are designed to be used with BDS lift systems. These have the added benefit of DSC (dual speed compression) adjustment for easy-to-use high-speed and low-speed compression tuning build into the end of the reservoir to dial in the performance for various terrains. These coilovers use a large 2.5" body, 3" coil springs, 7/8" hardened carbon steel shaft, high flow piston, JM92 advanced racing shock oil, CNC machined 6061 T6 ends, and DSC external remote reservoir to improve damper capability across any terrain.
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Coilover Mounting Kit
This Box Kit includes the following products:
- Driver & Passenger Side Upper & Lower Coilover Mount
- 2 Reservoir Brackets
- Bolt Pack - Coilover Mounting
- Bag Kit
- 6 11.5" Zip Ties
- 2 Small 'L' brackets
- 2 7/8" x 0.406 mounting hole clamps
- 2 Offset Brakeline Brackets
- 8 Nut Tabs
- Bag Kit
- 2 Aluminum Control Arm Spacer
- Bolt Pack - Main Hardware Kit
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Coilover System Box Kit
This Box Kit includes the following products:
- 2 10" Sway Bar Links
- Bolt Pack
- Bolt Pack - Sway Bar Links
- Bolt Pack - Skid Plate Mounting
- Passenger Side HD Differential Drop
- Differential Skid Plate
- Front Differential Bracket
- Bag Kit
- 3/4" X 0.090 X 2.950 Sleeve
- HD Weld-in Plate
- 2 Hourglass Bushings - Wide
- 4 Stem Bushings
- 4 Stem Washers
- 2 3/4" x 9/16" ID x 1.575" Rolled Sleeves
- Loctite
- 6 11.5" Zip Ties
- Bag Kit
- 2 Offset Sway Bar Brackets
- 2 Front Diff Poly Bushings
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Coilover System Box Kit
This Box Kit includes the following products:
- Front & Rear Crossmember
- Passenger Side HD Differential Tube
- Sticker Tube
- Bag Kit - HD Driveshaft Boot Extension
- HD Driveshaft Boot Extension
- 4x42 O-Ring
- #322 O-Ring
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Upper Control Arm Kit
This Box Kit includes the following products:
- Driver & Passenger Side HD UCA Tubular
- Driver & Passenger Side UCA Assembly
- 2 Ball Joints
- 2 Nut Spacer Washer
- BDS UCA Sticker
- 4 UCA Bushings
- Bag Kit - UCA Caps
- 2 Ball Joint Cap
- 2 O-Ring
- 2 11.5" Zip Tie - Blk
- 2 3/8" x 0.406 Clamp
- Bolt Pack - Cable Clamp
- Poly Grease Packet
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Standard Knuckle Kit
This Box Kit includes the following products:
- Driver & Passenger Side Steering Knuckle
- Bolt Pack - CV Spacer
- 12 10mm-1.5 x 70mm SHCS
- 2 CV Spacer
- 2 Steering Stop
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3" Rear Box Kit
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Does the rear of your truck need a little extra boost? The BDS Add-A-Leaf kits are the perfect answer. This kit comes with complete instructions, new center pins, and new leaf alignment clamps. Order one kit per axle. Add-A-Leaf kits are sold as pairs except for dual add-a-leaf kits which are sold in sets of four.
Note:
- U-bolts are not included in add-a-leaf purchases
- U-bolts sizes are based on maximum OE leaf packs which can vary widely due to towing packages, GVWR variations, etc.
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Add-A-Leaf
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