Should be fairly easy. Just 2 bolts on the brackets and 1 through the shift. Hopefully they send you the whole assembly with the gear on the shaft already. Don't over tighten the bolts on the mounting bracket they have lock nut so just snug is fine.
These are pictures of my falling apart after our first trip out after we picked it up from the dealer.
I would Jack the slide shaft up to take the weight off. Then pull the 2 cross bolts out of the brackets.
Drop the cross shaft down and remove the bolt holding the gear to the shaft. You might want to loosen that bolt before you drop it down to make it easier.
Pay attention to how it all goes together before you disable it.
Well I guess you have 3 more you can look at if you get confused LOL
Make sure you count the teeth on the new gear and it matches the old one.
Also don't move the slide in or out after you drop it down as you'll put the slide gears out of time with each other. "I guess with the broken teeth it might be already.
Just measure both sides of the slid to make sure they match then mount the gear back on
Piece of cake...
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