No problem man. Glad I could help. With any forum you gotta take the good with the bad, but generally this forum is one of the most helpful.

I called RC not to long ago to see how long their fixed arms are at 4.5" lift. 16.25" you need adjustable upper arms if your going to push the lowers out to 16.5 or up. My castor was horrible with my lower arms at 16.5 and stock uppers. Differential was at 90* exactly. I was only able to go 16 1/8 on my lowers before caster got crazy

I just measured them and they are approx. 16.25-16.5" center to center.

Also, based on research I've done, the Caster needs to be at least 4-5° positive, or more? Am I reading the printout correctly in that the current caster is at 9°, which should be good?

I'm not sure if it matters or not, but our Cherokee is a 2wd and just has a straight axle, so no worries about a Differential angle.

Didn't catch that sorry for the confusion.

Ideally yes I believe that is how it's supposed to be. but on a lifted jeep this cannot be attained without rotating the knuckles. but since you don't have a front driveshaft.. I guess it doesn't matter. get the IRO adjustable arms and see what you can come up with

for average lifted jeeps that have to account for pinion angle I think it's between 5 and 7* negative caster. I had something like 10* and it was causing some pretty wonky handling on the freeway. I put it down to about 5* with my long arms and it was night and day.

According to chart caster exactly the same ,toes only thing they changed caster should be around 5 geg......Read this.http://go.jeep-xj.info/HowtoAlignment.htm

You are correct. So my question would now be, is what looks like +9 on the printout OK, or does something need to change? I looked at the link provided for DIY Caster adjustment, but they are using the flat area on the "chunk" to measure the angle, where my 2wd has a tubular, straight axle. I'm not sure I can use the same technique for adjustment since the tubing has no flat surface?

He has 2wd. I don't know of any side effects of a little to much seeing as he does not have to worry about getting vibrations with to much castor.

From all the reading I have done. I take it as to little castor causes DW to much causes DS vibs. You have to find a happy medium. (Unless your 2wd) am I wrong here?

Caster should be checked at knuckles on 2wd ...

shouldn't it be checked at the knuckles for every axle?

Yes some do the yoke on front but that's gonna give more of ds angle than caster...

Anytime someone ask about alignment somebody post this link http://go.jeep-xj.info/HowtoAlignment.htm He tells you to measure off the diff bolts or beside it and use his conversion. I would bet that's where most guys measure.

Wow. I just skimmed through and that looks like a lot of work to find caster. Isn't caster (for Cherokees) just the imaginary line drawn up and down through the ball joints? Just measure from the top of the C

Yeah. There is a picture chart of that somewhere.