2003-2013 Cummins Add-A-Leaf Pack (8516-02-400)

Fits

This Synergy Add-A-Leaf Pack for your Cummins improves ride quality on both on and off-road driving, includes all necessary hardware, and most importantly; bolt-on installation!

• For 11.5" AAM Rear End w/4" Axle Tube w/Dual Center Pin
• Progressive 5 leaf design replaces the factory overload spring for improved ride quality both on and offroad
• Eliminates the harsh spring rate ramp-up caused by overload engagement
• High-quality 9/16" E-coated U-bolts, F436 extra thick hard washers and GR8 tall nuts included

Includes:

• 8516 Add-a-leaf packs dual center pin
• 1/2"-20 UNFX6.0 inch long replacement center pins
• 9/16"-18 UNFX4.0 inchX11 inch long HD E-coated U-bolts
• 9/16"-18 UNF GR8 tall nuts
• 9/16" ASTM F436 hard washer extra thick

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• The installation of this pack will affect the truck's load-carrying characteristics when the factory overload is removed. You will notice more squat in the rear when carrying heavy loads. If large loads are frequently hauled, we suggest adding some form of airbag kit in conjunction with this kit for optimum ride and load-carrying characteristics.