15 speed roadranger help

So I'm having some issues with input shafts on my transmission (RTX-15615). My old input shaft was an 18837, which has been replaced/updated by part number S-1409. Well the gear teeth on the S-1409 shaft are narrower than the old 18837 shaft, which means the shaft has some rotational play when installed in the drive gear. Is this normal or is there an updated input drive gear that needs to be mated to this particular input shaft? The old shaft meshes into the gear with no rotational play whatsoever.

 

That's what I'm thinking. I might call Eaton directly and see what they say.

 

I'm using that right now. The input shaft should be the correct number. Just the drive gear I need to verify. Hopefully there's a number on it that I've overlooked.

 

My biggest concern was shearing the gear teeth off the shaft while going from coasting to power or power to coasting. I just don't want to have to drag the transmission back out again shortly after having it opened up.

 

Gear is item #5. Shaft is item #7. Old part number for the shaft is what came out. New number (S-1409) is what I have.

My drive gear had the old number (K-19642) stamped into it but someone, likely a rebuilder, had attempted to scribe it off and had freehand engraved the new part number (20460) onto it.

 

Old shaft left, new shaft on right.

 

Sorry for multiple posts. Uploading issues. Old p/n scribed off and updated number freehand engraved. No idea if its going to work ok or not?