I installed a Subaru R160 into my 510. The stock unit is a 3.7, not sure if that's the gearing that you're looking for. I have never explored the fitment in a Z, but it was a huge improvement to my 510.

I knew I remembered seeing this recipe out there somewhere...

http://kmhafer.datsun510.com/Subaru.htm

Brian, Did/does it have bolt in stubs or snap in. Did/ do it have the same flange for the half shafts. Does a 510 have the same 4 bolt pattern on the flanges as a "72" Z. If the subie r160 has the same 4 bolt pattern as a z then the only other issues would be strength of an r160 LSD and width at the outside edges of the flanges. I think the Gary Savage VG30T test says it will hold the power. (I may go with a rebello 2.7 225hp engine). Anyone know about the width issue. I went to the 510 realm and found several hours of reading, but never found a straight answer about the z r180/ subie r160 lsd compatibility. 3.7 gears would be ok, 3.9 better and 4.11 ok also

neal

According to the article that I referenced above, the dust shields on the halfshafts are different between the Z and the 510, and that screws up the fitment. I have never looked into this in detail on the Z, as I mentioned, but it's not difficult to see how this added complication might be the reason that the Subie R160 LSD swap is done commonly on 510's and not on Z cars.

There are other LSD options for the Z. Have you looked into those?

That's the info Brian. I was typing my response while you were adding the second post. The 240 Z stubs are the same as the 510 except for the dust shield location (tack welded) and maybe the 4 bolt pattern. Sounds like a simple repositioning of the dust shields. Grind and retack. Am I missing something? As far as other options... yes I have and am looking into other possibilities and am open for any suggestions. I've put way too much $ into this car already so why stop now. I am willing to spend the bucks to get what I want. Anyone, shoot me a new idea... LSD, 3.7 or 3.9 or 4.11 gears

neal

I've put way too much $ into this car already so why stop now.

That's the spirit! Good luck, and let us know what happens.