You shouldn't have to removethe uppers, just lift up on the upper A-arm as you did to install the spacers. After I installed a set of spacers on a project rig, I went back and replaced all of the ball-joints with no problems.

Did you also crank up the t-bars for mor lift? if you did, this may be why you vcan't get enough room.

More than tread lightly. Leave it like you were never there, nor anyone else.
'90 X-cab 4.88's 33 BFG AT's, rr ARB, Headers, Ignition upgrade, cold air induction.
'91 X-cab 5.29's 315's BFG MT's, rr ARB, custom bumper and flatbed