alright, now we're kinda getting somewhere.
pull the LCA out entirely and see if the t-bar will slide thru the mount to around the position it's supposed to be. if the bar won't slide, there's something up with the hex either on the bar or on the mount. check, clean, inspect and retest.
then do the same on the front socket of the LCA, fit it up to bar outside of the car. it should slide all the way home. if no dice then there's either a burr on the bar or in the socket, or there's too much grease and the thing is hydro'd up in there. clean inspect retest.
so, now if both are cleanly fitting the bar hex ends, and you're still having install issues then you know something is out of whack.
here's an odd question, the LCA pin didn't get pushed past the back of the bushing and into the socket area when it was installed did it?