Are you talking about the D44 that actually has a thicker ring gear compared to older D44 axles?
Sent from a a few tin cans and some string.
No, I don't believe that's what he's saying. Paul was saying- most axles have a different carrier for either higher gears, or lower gears, with the cutoff mostly being around 411. This happens because the pinion gear gets smaller and smaller the numerically higher the gears get, and when the pinion gets smaller, it in turn moves away from the ring gear ( which is bolted to the carrier). There are 3 ways to make this work.
1- a new carrier that moves the mounting surface of the ring gear closer to the pinion
2- a "thick cut" ring gear
3- a ring gear spacer or shim ( I've seen these used, but wouldn't personally recommend it if avoidable. If you've bought the wrong gears or carrier though, and need to make them work, this can be the option for you.)
My ride- 2001 power wheel, 11" plastic tires, upgraded battery, boat sides, custom bumpers, tow hooks, new paint.