[CC69Rat]

As others have said 4" drop in the rear wont really put you in the position where youd need to notch the frame. You'll be ok as long as youre not hauling cattle or something in the back.

The shock relocation brackets are very cool and will just help you recover the ride quality overall. Lowering the axle closer to the frame just puts the shocks in a more horizontal position than vertical. The relocation brackets will help correct that angle. the No Limit kit is the way Id go.

I would suggest an adjustable track bar too, but that's just me. Im sure there are people out there that havent added the track bar but just sayin, I would.

Hope this helps. Good luck with it, and post up some pictures when you get finished with it.