PSA.
Keep your eye on the gears if you get a kit.
Horizon sent me free replacements for my front and rear after they started coming apart after about 5 packs. They said normally they don't, but mine had some abnormal wear.
Looking at the new gears, they are dimensionally different than the ones I got in my kit. The ones that came in my kit were not as tall of gears, and I believe that led to their demise.
I shim the output shaft so the pinion does not move in and out, and the ring gear if it has too much slop side to side.
https://photos.app.goo.gl/eLBJR9voYNy2XkGW8