2003-2007 Cummins Long Arm 6" Lift Kit (BDS647H)
Take your Cummins to the next level of stance and control of a 4-Link Long-arm suspension while sending it off to the moon with a full 6" of an increased ride height! This suspension system features 6" progressive Pro-Ride Coil Springs and solid steel upper long arms and thick tubular lower long control arms. The long control arm reduces caster change through wheel travel creating a more controlled feeling in the steering wheel both on and off-road.
Tire & Wheel Combinations:
- 37" x 12.50" w/ 17 x 9 and 5"
Notes:
- The rear u-bolts will not fit dually applications.
- These vehicles were manufactured with two different diameter rear axles. You will need to measure the diameter of your rear axle before ordering. It should be 3-1/2" or 4" in diameter.
- Although unusual, if driveline vibration occurs, order the transfer case drop kit available in the optional accessories section. These transfer case drop kits only work with automatic transmissions.
- Some 4" rear axles with the dual overload option will require four u-bolts 4068 listed in the accessories.
- Depending on the factory transmission mount, some 6" kits may require the transfer case indexing kit if a front driveline vibration persists. See installation instructions for details.
Installation:
- Click Here For Installation Instructions
- Difficulty: 3 (where 1 = easiest and 5 = complicated)
Part Number: BDS647H

6" Front Coil Springs
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6" Long Arm Box Kit
This Box Kit includes the following products:
- Pitman Arm
- Track Bar Bracket
- Bolt Pack
- Driver & Passenger Side Brakeline Adaptor
- 2 Bump Stop Bracket
- 2 Urethane Bump Stops
- Driver & Passenger Sway Bar Mounts
- 2 Steering Stops - Weld Ons
- 2 Sway Bar Link U-Brackets
- 2 5/8” ID Hourglass Bushings
- 2 3/4” ID Wide Hourglass Bushings
- 2 .625 x .109 x 1.375 Sleeves
- 2 .750 x .090 x 1.575 Sleeves
- Bolt Pack - Sway Bar Hardware
- Bolt Pack - Misc. Hardware
- Bolt Pack - Bumper Spacer
- Front Driveshaft Spacer
- Bolt Pack - Driveshaft
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Control Arm Box Kit
This Box Kit includes the following products:
- 4 UCA Sleeve .750 x .095 x 2.33
- 2 LCA Sleeve 1.00 x .1875 x 2.60
- 2 LCA Sleeve 1.00 x .120 x 3.25
- 8 90 Degree Grease Zerk
- Driver & Passenger Side Upper Control Arm
- 2 Lower Control Arm
- 8 UCA Bushing - 3/4” ID
- 4 LCA Bushing - Axle
- 4 LCA Bushing - Frame
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Control Arm Mounting Kit
This Box Kit includes the following products:
- Driver & Passenger Side Long Arm Brackets
- Bolt Pack
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4" Rear Block Kit - (3.5" Axle Tube)
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4" Rear Block Kit - (4" Axle Tube)
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5" Lift Leaf Spring - (3.5" & 4" Axle Tube) (2x)
BDS Glide-Ride leaf springs will reduce axle wrap and create a more controlled and stable feel when towing. The actual leaf spring may not be exactly as shown in the photo. Includes OE-style bushings installed.
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Required if you have selected full Leaf Spring Replacements.
Select the appropriate U-Bolts that fit your axle.
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U-Bolts - (3.5"X12.5") (4x)
Select these U-Bolts if you have a 3.5" Axle Diameter.
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U-Bolts - (4"X12.5") (4x)
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