Yah the 242 has a 32 spline output shaft. As for the clunk, check your caliper bolts. when I did the caliper swap mine came loose after a few hundred miles. Had to tighten them down in a walmart parking lot in the rain. As far as the pinion preload, I would search. There is a really nice writeup on here, alot of pictures and details on how to do it. You will need a dial type torque wrench that reads in inch-pounds. Youll need to measure the rotational torque before you take off the old flange. Youll need to take everything off, brakes, hubs, axle shafts, to do that properly.
Get a new pinion nut bolt as well. Mine was put on and cross threaded so when I took it off it made a mess. I ended up having to pull out the differential. I was able to fix the threads with a die and thread file. Wasnt a fun two days. Some people mark the old bolt and then tighten it down on the new yoke to where it was plus a little more. Id suggest getting the factory service manual and familiarize yourself with this. The factory service manual is pretty detailed and tells you step by step how to set the preload.
TL;DR: search for the write up on setting the pinion preload and get the FSM. Replace the pinion shaft seal while your at it. Check your caliper bracket bolts.