That is very true and could be the case, they also say that you should never run polyurethane bushings in your rear upper control arms. They say it causes severe binding but yet there are countless companies who sell uppers with the poly bushings. Probably trying to push their torque arm setups. They do sell great products tho, cant knock them for that.
I've actually heard the no-poly in the upper arms arguement before from other sources. I actually agree 100% with that.
I am not saying the 96+ spindles may or may not have a issue on pre-1996 k-members, i am just saying i would like to hear other sources claim the same info. So far i have not. i don't really have a view either way until then.