I think I would pull the engine. Unless you had a catastrophic failure with your fan, and it has been replaced lately, I am going to guess that the flanges on each end of the drive shaft, connected to the flex joints, are stuck to the shaft pretty well, and will require heat to separate the shaft from the flanges. I used anti-sieze grease on the end of the shaft when I re-installed the flanges with new roll pins from Caterpillar.
With my new fan, I had a little trouble getting the snap ring to hold the fan in place. Along with a heavy snap ring from Caterpillar, I also used a little bit of black silicone to glue the fan to the shaft. Be sure to check the service manual for proper spacing between the fan hub and the connecting flange. I think it is 1 1/8".
Pulling the engine also gives you the chance to tighten the front axle in its carrier, and adjust/rebuild the steering sector as necessary. You can check your ISO mounts, snubbers and do the engine cradle modification if you haven't done so already.
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