There's a company called Nitro Gears that makes ring ad pinions and it looks like our cars have a pretty generic 8" Toyota fitment according to their chart and they sell for less than $300.
https://www.nitro-gear.com/Toyota-8-...-488-29-ng.htm
Given the really low torque application of the 86, I can't see much going wrong here. I don't really care about noise since it's a track car.
Just thought I would ask to see if anyone has tried out their R&P and had experiences to share