2013-2018 Cummins 6" 4 Link BDS Lift Kit (BDS1603H)
Completely revamp your Cummins with the BDS Suspension 6" 4-Link Suspension System. The latest suspension system option to come from BDS is a complete conversion system for the new radius arm suspension on the Ram 3500. The design starts with 2 massive frame brackets that provide the mounting points for the new upper and lower control arms. These brackets locate off of the factory radius arm brackets, no factory bracket removal is required, this provides a more controlled steering feel in any terrain and better suspension geometry with reduced caster change through wheel travel.
Tire & Wheel Combinations:
- 37" x 13.50 w/ 17" x 9" and 5.625"
- 37" x 12.50" w/ 18" x 9" and 4.5
Notes:
- Kits come standard with a 6-Bolt indexing ring kit. If equipped with heavy-duty 8-bolt t-case order 122813 in place of 122623
- For rear leaf spring equipped models only.
- The carrier bearing drop (122405) is necessary for models equipped with a two-piece rear driveshaft.
- Minor amount of welding is required
- Some vehicles may require rear driveshaft spacer kit 122007 to maintain adequate rear driveshaft engagement
- Will not fit Cab and Chassis models
- Not for use with factory rear airbag suspensions
Installation:
- Click Here For Installation Instructions
- Difficulty: 3 (where 1 = easiest and 5 = complicated)
Part Number: BDS1603H

6" Front Coil Springs
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6" 4-Link Box Kit
This Box Kit includes the following products:
- Driver & Passenger Side 4-Link Brackets
- 2 Weld-In Bungs
- Rivet Nut Installation Bolt Pack
- 2 1/2" Rivet nuts
- 2 1.00 x .120 x 3.25 Sleeves
- 2 1.250 x 0.312 x 0.875 Sleeves
- 2 5/16"-18 x 3/4" Type 23 Self Threading Bolts
- 2 1/16” Shims
- 2 1/8” Shims
- Pitman Arm
- 4/6" Track Bar Bracket
- 2 Track Bar Cam Washers
- Fish Wire
- 1/2" Bolt Tab
- 1/4” Spacer
- Sway Bar Drop
- 2 Bump Stops
- 2 BDS Badges
- 2 Rivet Bolt Packs
- Bolt Pack
- Bolt Pack - 4 Link Brackets
- Bolt Pack - Sway Bar Drop
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4-Link Box Kit
This Box Kit includes the following products:
- Upper & Lower Control Arm 4-Link Conversion
- 2 Straight Grease Zerks
- 2 1.00 x .120 x 3.25 Sleeves
- 4 Bushing (Large - Lower Control Arm)
- 4 Bushing (Small - Upper Control Arm)
- 2 .875 x .156 x 2.62 Sleeves
- 2 90 Degree Grease Zerks
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Ram trucks have an optional Aisin heavy-duty 6-speed transmission available in the 3500 trucks that utilize a different transfer case mounting bolt pattern (8-bolt). The 8-bolt kit also includes an internal shaft seal extension and a new shaft seal.
6-Bolt Transfer-Case Indexing Ring
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8-Bolt Transfer-Case Indexing Ring
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4" Rear Block Kit - (4" Axle Tube)
Note:
- This selection removes the standard 5" rear block kit and replaces it with a 4" rear block kit.
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5" Rear Block Kit
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4.5" Lift Leaf Springs (2x)
Note:
- Selecting this option will replace the included rear block kit with new rear BDS Glide-Ride leaf springs and is designed for 4.5" of lift giving a level stance.
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Required if you have selected full Leaf Spring replacements.
No Thanks

Universal U-Bolts (4x)
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