I've got a '78 3/4 ton Chevy p/u and it needs the u-joints replaced on the front driveshaft. I did the front one alright, it's the rear 2 that puzzle me. How do you take it apart? I see pins or something going through it. I also only got clips with my new u-joints. How do you get those pins out and are the clips right or did I get the wrong joints?