For IRS, several have been used on the 1200

Datsun 510 with Subaru diff, LSD is easy to find



Subaru disc brakes. Bolt to leaf-spring eyes and rear mustache bar. Custom A-arms



S14 (Nissan 240SX) narrowed

Ford Ranger 8.8 with stock axles fits the 1200 width-wise. Mazda B4000 and Ford Ranger 4.0 1990-1992 have the shortest 8.8 with 28-spline axles (1993-up are 1.5" wider). Obtain an additional short-side axle and cut only one side of the axle housing to narrow it. Door tag AX R6 indicates axle tag 3L73 (limited slip). Axle bolt pattern is 5-on-4.5" (same as Nissan S14)

But that's crazy strong and heavy

I'm needing something beefier than the stock H145 for my 1200, but nothing crazy. I'm putting a 1.8 Miata motor in my car and I'm not sure what the best option in. I was hoping to get suggestions from others here in the U.S. based on my thoughts.

Option 1: Ford Explorer 8.8 w/posi+disc brake. Would need to be modified and smaller axles fitted.

Option 2: Full custom axle built by Curry or other. Seems like the cost just doesn't warrant having a solid axle still.

Option 3: Miata rear subframe fitted to Datsun. Would allow for LSD, disc brake and IRS.

The goal with the car is track days mostly. I'd really like to have an LSD and disc brakes, but could live with still having leaf springs in the end I think. Can anyone thing of a better option for me?