Correct.Originally Posted by 07JeepXK
The result of this difference is that the HD UCA's from HM Engineering can be used for every lift available. The UCA's with the spicer ball joint can only be used with a lift for were the UCA's angle is corrected for.
This is a statement placed on an other forum on the exact same UCA's:
"Poly bushing are overated IMHO. First off they are the same bushing that are in your stock arms, which means wide availability.
Secondly they take out some road impact and don't require special grease like most poly bushings do.
Right now these are based a 2.5" lift geometry (over stock). This pretty much covers everyone except for the 4" Superlift (and equivalent) guys, since they are designed to run stock geometry arms.
Those as well as ones for stock/lowered WK/XK's will be on there way".
In other words stock / 4" lift require a different set of arms than the 2" lift. This is only because of the limited travel of the spicer ball joint.
Also, the poly bushings might be overrated but I do have read in several threads (on other forums) that the UCA bushings are worn / damaged on XK's and WK's. IMHO, better overrated. This means that they are probably don't have to be replaced at all.
Since the HM Engineering UCA's are designed with desert racing /experience in mind they might be overrated. Personally, I don't mind that at all, especially not on a critical part like this one.
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