Haven't accomplished a lot in the last couple weeks, been sick and busy with other things. Still need to get the throttle body sorted at a minimum before we put the engine in. Will hopefully have engine mounts this week.
Biggest thing we accomplished was swapping in the R180. Left to right, "one bolt" (earlier) R160, "five bolt" (later) R160, R180. Some studs and plugs swapped over.
Definitely one good reason Subaru has a Lego reputation. After swapping over those studs the R180 bolts right in.
Weights are 37# (1 bolt R160), 47# (5 bolt R160), 57# R180. 5 bolt R160 is definitely a 4.11 open diff, I assume the 1 bolt is open also but probably 3.7 or 3.9. I was shocked how much weight difference there was between the R160s.
Had to trim one of the little diff mount brackets so it would sit flush on the R180.
While we had this out I cut the tuned mass damper (?) off.
Surprisingly only weighs 1#, seems heavier. Thinking by adding 20# of rear diff we've ruined whatever NVH tuning that was supposed to accomplish.
STI driveshaft appears it will just bolt in. Looks to be a little on the short side, anyone know if the splined part towards the rear is supposed to telescope? There's definitely splines under the rubber cover but we couldn't get it to budge.
Looks like we need to make the rear lateral links a little longer than what we'd mocked up for the R160 but I think then they'd work with either diff. Still need to machine the RR billet knuckle, started programming that the other day.
B and I also worked on putting a planetary low range in my other STI 6MT. He swapped over the various reverse lockout parts, etc. Unfortunately the rear output shaft has about .008" (.2mm) endplay so I need to get a thicker shim and swap that out.