Just to clear up a point that the others have missed concerning the spring pockets, the half ton and light duty 3/4 ton (those being the 3300 lb front axle rating) trucks do NOT have a spring pocket. The springs sit on the top of the control arm, not down in a pocket. The heavy duty 3/4 ton (4400 lb axle rating) and the vans as previously mentioned all have a pocket that the springs sit in as shown in the pic above of the custom built control arm. Using one of these pocketed arms on a truck that does not have a pocketed arm will lower the truck, using the stock spring for the truck. If your truck has the pockets, then you will need to either cut your springs, use 1/2 ton springs, or modify the dakota spindles to fit the larger bolts used on your truck.

Clear as mud, right?