Wedges might be the way to go. You'll have to see after you have the arms on. You will see the coils bent.

 

Your would be better off with something like this instead of wedges.



JKS adjustable coil spring mounts

 

X2 on the spring purches. With your 4" lift wedges won't get you enough of an angle to straighten out your springs. You'll be able to move the axle back about an inch before you have clearance problems with your track bar. Also with your lift you really need upper and lower adjustable control arms to get your suspension dialed in for good drivability. Also consider a HD rear sway bar to help in the corners, with all of the weight that you have bolted on and your lift it will make a huge difference. I had great drivability using the Full Traction bar.

I used my stock DS's for about 10,000 miles on a 3" lift. You can use your stock DS, but it won't last long.

 

had 20k on my 2dr Rubi 6spd with stock ds's and over 3"s of lift and no problems and no arms, i have a 4door now...or are you saying from moving the axle back it wont last? as far as the rear track bar, im using the TF HD bracket with good results.

 

You'll be fine moving the axle back. I moved my axle back when I went to 37's. The issue with the DS's is that your increased lift height causes excessive angulation of the joints in your DS's. Eventually your DS's will start throwing grease. When that happens it's time for new DS's. Mine lasted 10,000 miles others have gotten more, but eventually it will happen.

Adjustable control arms in back will allow you to move your axle back and you will be able to set the pinion angle correctly. Setting your pinion angle correctly will increase the life span of your DS.

Your HD track bar is definitely a good thing. I was talking about a HD rear sway bar. It will tighten your rear suspension up without adversely affecting your off-road capability. It made a huge difference for me.