I have a 97 XLT SP with rev. To make things easier on yourself, take the top sprokets retaining nut off as well as the bottom sprokets retaining bolt. Just be sure you really look at how all the sprockets, nuts, bolts, washers, etc come off, so you can put them back on in the correct order.
Be sure to check all of the gear's teeth as well. You want the yoke on the inside up (the lever thats attached to it down) when you put the cover back on so the reverse will engage. Just take your time, and really watch as you take it apart and you should be all set. Oh, the bottom sprokets retaining bolt, collar and spring can be a pain to get threaded back in, due to the spring tension. Be patient and stay at it.