Perfection Gear ID???

I have a Perfection American Gear here and I can't ID it. My book only goes up to '65 and another goes up to '68, but I still can't find it. It's a number AT90A-10. Here's some pics of it:







Thanks for any info!!!

 

To me it looks like a T90 low and reverse idler for a T90 3 speed trans they used in jeeps studes hudsons and many more but i mite be wrong

>>>>Clay

 

That's what I would guess too. Standard transmission part numbers follow a system...makes it easier to figure out what they are.