And if you can't get the snap rings out, give the U-joint cap a wack with a hammer.
It will drive the cap down slightly and ease the pressure against the snap ring.
The normal force on the U-joint as it spins causes the caps to push outward against the snap rings pretty much pinning them in place and sometimes a bugger to remove.
97 Sahara, 74 Renegade, 72 CJ5, 55 Willy's (the Beast) Boss 302, 6:34 gearing, Bose 901 speakers.
God I miss that Jeep. Forgot the kinda Jeep, 80 SX4.