If you do wheelies ALL DAY LONG in your 1466, it can be ALOT of fun. But the hard surface on your ring gear and pinion may be getting sparse after a few to many. You could pit a bearing or two also. But don't worry, it's ok.
Lets take a deep dive into the rearend of this IH 1466.
If you cannot find any good used parts, here is an aftermarket option.
Ring Gear and Pinion Kit- https://www.redrunrite.com/gear-shift...