Middle Gear Oil Seal

[Bill W.]

After pulling out the rear linkage to install zerks and fix a bad bushing, I see that there is oil leaking from the boot on the swingarm. And has been for a while, from the looks of it. I guess I need to replace the oil seal on the middle gear. So, after getting the swingarm off, do I pull the entire Ujoint/shaft/assembly off of the engine, and then take the yoke off of the shaft??? Or, can I get the yoke off the shaft and replace the seal without doing all that??? I've also heard bad things about removing/installing the rubber boot. Am I worrying for nothing?? This is uncharted territory for me, I don't want to mess this up!!!