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If you installed just the shackle portion of the kit it would level your truck but if you added the coils up front it would put you back to square 1 just a couple inches lower. I'd suggest going with just a pair of shackles like Bluejay said.
Putting 2" shackles on by themselves will change the angle of the driveshaft in relation to the pinion(the rear end). Some have experienced a vibration, some haven't. Regardless, the angle change can not be real good, over time. Buy a kit such as Ground Force offers, that includes wedges. They go in the axle perch and restore the proper angle. Make sure you installation price included the wedges.
Paid just over $600 for the kit on ebay. The guy is still selling it all separately which is how I bought it. You just need the leafs and coils, front struts and rear shocks. Is your ruck 2wd or 4? I have a brand new H&R kit that consists of 2" drop coils and 1 1/2"-2" drop rear shackles. I have it it listed in the classifieds for like $225 or something which is a great price. let me know if you want it. If your truck is 4wd then you can take the rear blocks out too to get it level.
It was about 4 years ago at a Fort Worth truck shop. Paid about $95 for the kit and they charged me $40 for the installation, which was way cheap for the installation. If you are ever up DFW way, get Patrick to install them. He does very good work and knows what he is doing on suspension. Be sure to get the wedges installed.
Thanks for the compliments...My truck IS level but it's not leveled. I have a Saleen sport truck spuspension drop on it which nets me about 2-3" drop in the frot and 4-5" in the rear. It's an FX4 and it has 33.3" tires so it sits higher than most lowered trucks.