I don't think you have anything to worry about till you go past 3.5/4" or 90/100mm. Then you might (or might not have problems as each lift is different) with the drive line and need to look at custom drive shafts like double cardons etc. I am running my WJ without a a-arm spacer at the moment with no probs but I am thinking of puting one in soon. In regards to the spacers I have (and I think that they are terra flex units but not positive) they have been fine with no issues. I am runing about a 3" lift and overall there is no problems with it. The only area that I would like to correct is the trackbar/panhard and replace with an adjustable to correct the axle alignment.
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