Ford Repair: rear-end, arb air locker, ford flareside

Question
i have a '95 ford flareside with a 5.0 and aode trans. lowered, chip, ,posi lock spoil, 373 gears, supercharger and nos. The gears and spoil was just put in about a year ago. not sure the brand, but it was about $400-$450 for the spoil. how do i rebuild the spoil and replace bearings? or where can i find out? It shakes really bad at all speeds. new tires(good ones,$300/each) and alinement only a week before. It happened all of a sudden. the drive shaft will turn back and forth and a 1/2 to 1 inch or so. The tires will pull out and 1/8 to 1/4 inch, no side to side though. in the air, if you spin the tire back and forth, it locks with about 3-4 inchs of spin back and forth. then it will spin with clicking noises. then lock again. I changed shocks and reblanced the tires again and that helped alot, but still shakes all the time. Afraid it will go out when i'm driving. i've been easy with it since then. the only thing on the spoil was:
DCP
9I9
shaped like a small coffee can, smooth sides. Three pieces, with teeth/ notches inbetween them.  

Answer
William-

  If the car sees any street time, I'd ditch the spool altogether.  A true spool is for straight line traction ONLY.  It will allow the wheels to turn at different speeds, like in a turn, but this will also wear it down and eventually it will break (as you've already noticed).  If the truck is a track only toy or if you're married to the idea of having a spool, contact the company you bought it from and they should have a rebuild kit with instructions.  There's no generic spool so instructions are hard to give for a rebuild.  If you do choose to switch it out, a great option is the E-locker (made by either Eaton or Auburn...can't recall at the moment) but it acts as an open differential most of the time unless you flip a switch and then it acts like a fully locked spool.  It's electric so no need for CO2 canisters like the ARB Air Locker (same principle, but it uses compressed air instead of an electromagnet).  Hope this helps.

Steve