Ramforums

Not sure, off to research...

They look identical to me. The only thing could be that they have different spring rates for the different truck weights.

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Toy Hauler: 2004 Ram 1500 SLT RCSB ~ 4.7L ~ 4x4
exterior: Leveled ~ 285/70R17 Silent Armor ~ debadged tail ~ added fogs ~ 35% windows
interior: Tekonsha Brake control ~ Rockford Fosgate 10" Sub with RF amp

i belive the springs are rated different for weight diff in reg cab/quad cab.
otherwise it is the same kit. street performance shocks and springs.
new bump stops too.

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mcgaughy/belltech/vararam

front springs are different due to cab weight, rear are the same for 963 and 964

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2011 Dodge Ram 2wd

I am assuming that the 963 are more stiff of a spring due to the weight