My brother and I did his RC 2" lift with the clevis bracket still installed. His jeep has 120k+ on it and that bolt was NOT coming out no matter how much we soaked it with PB Blast, 4ft breaker bar, hit it with air tools and heat from an acetylene torch..... it just was not enough! I guess being an '06 with 120k didn't help.
Ok so... Assemble everything (minus the clevis portion) - new strut and lift spacer. Then feed the upper half of the strut assembly into the wheel well and line up the 4 bolts up top under the hood (we installed all 4 nuts up top to help keep the weight off the strut assembly, do NOT fully tighten) Next line up the clevis bracket and the bottom of the strut the best you can. Keep in mind the tab on the back of the strut with fit into a slit on the back of the clevis bracket.
**From here on out you will need 2 people**
Once the lower portion of the strut is lined up correctly with the clevis have someone stand up on the lower control arm/wheel hub and put all their weight on it...this will flex the lower control arm down a few inches (momentarily) and allow the strut to almost drop into the clevis bracket.
The second person (with a rubber mallet) will need to hit the lower portion of the strut until it "pops" into place with the clevis bracket (we used alot of WD40 here to help lubricate the two) Mind you it took 3-4 attempts putting weight on the lower control arm/wheel hub (while hitting the lower portion of the strut) to get just enough clearance for the strut to pop into place and finally be in the clevis bracket.
*We got lucky with my lift install as i only had 35k on the clock and those bolts came out like butter*
Once finished crack open a beer and get ready for the second side!
I hope that helps!!