I had a 4" spring under on mine for a couple years. Ran 33" then added a 2" body lift and cut the fenders for TJ flares and ran 36" TSL's. Had the skidplate spacers and didn't "need" the slip yoke eliminator for it. The lift I ram was Explorer Pro Comp. It held up great.
http://www.texasoffroad.net/galleries/ohv/album161
Pic's of it when it was white are with it spring under. Orange and 36" TSL's are spring under. Orange with Goodyear Wrangler RTII's it is spring over with 1 ton axles.
For shots of how it worked go here:
http://www.texasoffroad.net/galleries/ohv/album126
Look at 2004, 2005 and some of 2006. The Jeep even got into JP with a 4" spring under lift, 2" body lift and 36" TSL's. Sometimes I wish I had left it in that configuration. Simple and effective. If you have questions just ask.