pb blaster is your friend. i just replaced mine a month or two ago using a pickle fork and a bfh. i really had to get angry at the thing to get it off, but i didnt let the pb soak for long. just try not to punch holes in your dust shield w/ the pickle fork during your rage like i did hahah.

alternating the position of the pickle fork to either side of the ball joint and hitting should help too. also try disconnecting your lower shock mount like kewlynx said and hitting downwards on the control arm itself if you didn't do so already.

87 22R PU, 2? body lift, 33? BFG muds, 4.88's, F&R Lock-Rights, Rancho Shocks, EB's Street RV Head w/ 268 Cam, LCE Header, 2" to 2 1/4" exhaust, Flowmaster 50 series, Magnaflow high flow cat, complete Herculined SR5 interior, V6 BB, MC, and calipers.