[CC69Rat]

Just trying to help you, most trucks with a 4.5" drop up front will usually run 5-6" drop springs in the rear. It just really depends on how low you want it. But just remember anything over a 4" drop in the rear you will want to relocate your rear shock mounts or it will ride like a train car.

I would suggest buying a 4" spring then a fine tuned adjustment adding a block to your liking. It will ride a lot better with a 4" spring and a 2" block, than it would a 6" drop spring for example.

Think about it like this. If I have a diving board, 12ft long. 250lb man jumps off the end, bounces and into the water. Now, same board, same man. Cut two ft off the board. Does it flex more or less? The same concept works for a drop spring. It's just torsional rigidity. A longer spring will ride like the longer diving board. Where a shorter one will be stiffer like the shorter diving board.

But I'd do 4" spring, 1, 1.5, or 2" drop blocks to adjust from there. Just my .02. Good luck with it man.