Agree with blue bird. If the multi leafs snug up tight and flat into the perches the bolt protruding through the hole in the bottom shock plate will suffice to keep everything in position once it's all bolted up. Sure the spring perches for the mono leafs aren't as deep but.they will stil hold the spring from moving out of place. Best not to use the isolators between the spring and perches because it will move the spring that much more out of the pocket. I agree you should go to some U-bolts to hold everything together. The original traction bars are probably what set your pinion angle. Not sure what type of traction bars you plan on installing but they may take care of that issue after bolted on as well. You want around 2degrees looking down on your pinion angle. Never want it straight with the driveshaft.