Originally Posted by reklipz
There's a 4.4 final drive from the factory on the BRZ/FR-S? What are you referring to here?
So you're aware that the backlash is adjustable, just don't trust yourself to do it? It doesn't seem that complicated, though you'll need a set of shims to work with.
Yes brz/frs came with 4.1, 4.4 & 4.6 according to their website. It's like 4.667 or some crap, but same difference lol these are a direct swap from my understanding, only needing a 1/2" spacer at the 2 lower bushings because brz/frs have shorter bushings. Simple enough.
Swapping 4.3 mk3 supra gears into the is300 pumpkin I would assume you would need to at least check and possibly set back lash and pinion depth and what not.
However the 4.30 supra swap thread by member avenier(sp?) says its a direct swap just use is300 shims. I'm pearly about that though.. It just seems like their would be a variance in the gears or depth or something to just grab the gears & toss em in using the existing shims. I pm'd bezik777 about this, hoping to here back soon.
I have a 4,3 diff in my garage but if its going to require us to set backlash and what not, I'll leave that to a shop. And preferably skip it all together, unless its a last resort.
My point is brz/frs guys apparently want our 3.73/3.91 diffs with LSD. So I'm thinking I can find a frs guy with a 4.1 or 4.4 LSD diff and just do a swap with him. If he wants my 3.9/LSD, I'll gladly take his 4.1-4.4/LSD. Win win, no worrying about setting up gears. That was my biggest point about bumping this.