The last time I bought it, 4 plus years ago, it was %10 of the total invoice price up to $295 on any single ticket. It may have changed since then.
When I first started with project "Floyd" I had 4WP do the ARB and R&P installs in both axles on the same ticket when I bought everything else, Alloy Axles, Rubicon Express lift, drive shafts, Bushwacker fenders flares(waste of money on a trail rig!).
It was a pretty big ticket $ wise, so the $295 for a warranty that covers all the parts and their labor on the gears was a no brainer.
I planned to wheel hard and fully expected to break parts.
The money they lost was enormous!
Warrantied parts including labor to install.........
2 Dana 30 gear sets with master install kits.
1 8.8 gear set with master install kit.
1 Dana 30 ARB.
1 8.8 ARB.
1 rear drive shaft.
3 Alloy USA inner Dana 30 shafts.
2 Alloy USA stub Dana 30 shafts.
1 passenger side Superior Super8.8 rear shaft.
I think that is about it.