I pulled a couple over the years... spray it with Penetrant and let it soak it may have contact rust between the shaft and the coupling.... also there may be a half moon key in there if it isnt splined so you may have to get it just right to slide the coupling off.... hope that helps

well couv sounds like you have the same problem i have.

After using the penetrant and letting it soak over night, use a torch on the shaft. Heat the shaft and that should do it

heated mine but still had to beat it to get it out. beeeee careful you can ruin the bearing and seal on the crankcase, i know happened on one of my godevils. best thing if its that bad is to take a small grinder with a 1/16 cutting disc and split the universal, and buy a new one. that being said i did some work on a friends godevil surfacedrive and replaced his shaft, and noticed the new universal they use already has a split in it for easy install and removal, but has a bolt that tightens the split after installment, making it easy if you ever have to pull it again for some reason. i would check with go devil for one of these if i still had my godevil.