Ring gear is out of an early 92 AWD auto, the left half of each tooth tip is machined different than the right half. Every single one. There's actually a step down about 0.05mm from the rougher to smoother serration. Any ideas if this is normal or a Mitsu fuckup, why I'm asking is because there's marks on the gear it meshes with (front output shaft) on the half with the rougher serrations, but not scratches, like glitter you find in tranny fluid.

I compared it to a 91 AWD auto ring gear and it's not like this, just one serration pattern(smoother like on my right half) the length of the tooth, but I do know Mitsu likes to change up helix angles/tooth patterns/counts and whatnot between years...

Also does anyone know why these serrations exist in the first place? Seems to me like these surfaces should be as smooth and rounded off as possible?

[img]http://www.dsmtuners.com/attachments/20160429_134929-jpg.299915/[/img]

and the front output shaft gear it meshes with

[img]http://www.dsmtuners.com/attachments/20160428_192041-jpg.299916/[/img]