You do not have to remove the driveshaft, only dis-connect everything on the rear end of it and slide forward enough to raise the shaft and then slide the old fan, flex disc joints and couplers off.'
Do not loose the ball bearing centering spacer between the couplers.
You may have to re-use the snap ring that secures the old fan if the replacement does not have one. Make sure it is in the correct position on the shaft as to not interfere with the lift linkage.
Also a good time to replace the spirol pins if they appear worn as well as the flex disc joints if they are hard, brittle and distorted.
Be sure to use spirol pins and NOT regular roll pins
Be sure to support the driveshaft with something solid when driving out the spirol pins using a 1/4" pin punch with the centering tit on the end.
Good luck!
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