The unit is pretty simple. Nothing to be afraid of at all. The rebuild kits are $65. If you have not driven it much since you adjusted it, it is probably OK. You said you followed the procedure. I used a fish weighing scale to measure steering wheel torque. Anyway they last forever because there are no Rev's or RPMs on the bearings. The huge worm gear does all the work. If you adjust both places again and check all the items listed by previous posters, you may be OK. Keep in mind these are fairly easy to find at $25/up, used, if you broke something and need a part. I think 57-59 is same column length and 55-59 same box parts. You must adjust these boxes in a certain sequence. It's just an end play/pre load adjustment of the worm shaft/bearing and a lash (or backlash) adjustment of the sector gear (fancy name for not a whole gear). They like you to do it all on the bench. The gaskets are easy to make and you can mix up your own lube if you do take it all apart and clean.
