87 TS1 Manual Transmission I'm looking to replace these gear oil for the first time. Any recommendation on what to use and basic process will be appriciated. I'm also replacing the RR wheel end CV joint boot. Thanks as always

How it going everyone. I just got back into another 87 Starion I grabbed out of New Mexico. Brought it back to El Paso and started to get to work. It needs a refresh has only 90Psi on all 4 cylinders but does run and move. Does have a few mods too. Has FIC Primary and Secondary injectors, FuelTech 450, and a tuned already uploaded. How true that part is I don’t know. It runs but has a noticeable misfire on it. Has a few other things I need to fix wiring wise as well and find some interior parts

Hello - Looking for either the part or any leads someone would have on it for part MD077383, an oil feeder control unit for my JDM 1985 GSR-V Starion. We're rebuilding the engine and this is the final component we need but any attempt to find it in Japanese auto stores online leads to the stores not having it in stock, them contacting Mitsubishi, and Mitsubishi not having the part. Any info, parts or help would be greatly appreciated! 

I was doing some cleaning and came across these parts. I don't recall what year of vehicle they came off of. I can provide pictures, but they are too large to attach in this post. Feel free to ask any questions.