Beardog

Sometimes when installing shackles the bolts will get over tightened while the suspension is hanging. When the truck is sat back down on the ground the shackles are in a bind because the bolts are too tight and the shackles can't rotate to their normal working position. Loosen the bolts with the vehicle sitting on the ground and bounce on the rear bumper a couple of times. Then tighten the bolts to spec with the truck sitting on the ground.

#4920 is the soft foam bump stop kit. With a 2" drop the factory bumps will probably work fine. Just try the factory ones and change out if you need to. The 4920's are pretty soft so when you do bottom out it's a soft squish in the back instead of a thud or hard bang with urethane bumps.

The 8510 is for a 5"-6" rear drop. A 2"-4" drop should use a 8504. (I'm Product Manager for Belltech so trust me on this). I come over here to visit from time to time from the Denali Truck forum. Let me know if I can be of more help. Regards,

What part numbers do you have?