Yep, I changed more U-Joints in Z's than I care to remember. . The tools required are: 1) a big vise (BIG) 2) a sledge hammer, 3) a socket set that you aren't too fond of.4) a punch or chisel So the process is: 1) Remove the half shafts. They are 14mm bolts, use a boxed end wrench so you don't strip the head. 2) Put the half shaft in the vise and secure so you can see the U-Joint. Next tap out all 4 retainer c-clips on the inside of the U-Joint cap 3) Again, with the shaft secured in a vise and the shaft side U-Joint going up/down, pound down on the u-joint to knock the bottom cap out. Turn the half shaft 180 deg and pound the U-Joint the other way knocking the opposite cap out. Repeat the process with the other part of the U-joint and flange. 4) Get new U-Joints out of box and take off caps on opposite sides. Fit both the caps on the outside of the shaft flange and set the middle part of the U-Joint in place. Put the whole assempbly in the vise (this is why you need a big one) and press fit the caps inward toward the middle part of the U-Joint. Be careful not to disrupt the needle bearings inside the cap. I usually set the middle part in the cap that is moving to hold the needle bearings in place. Also be careful to keep the caps going in straight so they don't bind. Once the caps are close take you socket set and find one that is about the size of the cap in diameter. Open the vise and put the socket between the cap and the shaft and close the vise again using the socket to seat the cap far enough in so you can see the C-clip ridge on the inside of the cap. Put the C-Clip in and repeat socket trick on other side. Do the same to the other half of the Ujoint. 5) Always replace both U-Joints at once 6) When replacing the shafts in the car, use the Emergency Brake to hold the shaft in place to put the final tightening on the bolts :classic: :classic: