They are just fine upto a 4" lift. Fixed length aftermarket tj lower arms are 16". Stock are 15.75". Use stock length, 14.75 "adjustable" uppers and you still have decent caster. Add a set of square re1478 cams and you have excellent caster and can still run a 33" tire under a stock fender without having an upper control arm 1/4" shorter than stock.
I used synergy ddb bushings religiously for 3 years. After 1 year, I was replacing bushings at an alarming rate and ceased using them completely 2 years later. After 2 more years I stopped having to warranty bushings. It wasn't just a few, I'd built hundreds of arms. I don't buy into the bad batch excuse. There have been plenty of ranch, Clayton and ready lift bushings that have been swapped out here as well, no just synergy.
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