So after I got the U-bolts and spring plates off I removed the existing spring pack bolt and put the shims in place. I needed to lower my pinion by about 3* so I placed the thicker portion of the shim toward the rear.
Here you can see the shim isn't quite the same shape as the spring.
But as you can see the shim was thin enough to allow it to conform to the shape of the spring when I torqued down the new spring pack bolt.
After that I did the other side and reassembled everything in the rear before I moved on to the front. Here is everything disconnected and ready for the shim to be bolted on to the front passenger side spring.
I always thought my Jeep handled pretty well so I was kind of surprised to find out that I only had .8* of caster when I had it on the alignment machine. So I wanted to add another 4* to get back toward the correct caster reading. The thick part of the shim toward the front to help increase caster.
The 4* wedges were a little thicker and did conform somewhat to the face of the spring but not nearly as easy as the 3* shims did. The head of the new spring pack bolts center the axle on the spring. I installed all the new U-bolts and spring plates, snugged them up, set the Jeep on the ground and torqued in three steps up to 115 ft/lbs. If I were going to do it again I would stop at 100 ft/lbs of torque.
Driver's side front shim installed.
After that I cut all of the new spring pack bolts and U-bolts to the correct length. Does anyone have a stock pitman arm they would like to get rid of?
A shot of one of the rears.
Adding the shims worked perfectly. My slow speed driveline shudder from a stop is completely gone and the steering is very stable. It tracks very well while the return-ability is improved and it tracked straight with my hands off the wheel for over a quarter mile. With the new tires, the CJ is an absolute joy to drive. I always thought the Dunlop Mud Rovers were great tires with long wear and fairly quiet as compared to most other mud terrain tires but I must say that the KM2's are very quite and have a very smooth ride. They are definitely a good tire.