2nd gen RY - 4.222 limited slip differential that I got months ago. Now cleaned up, painted and I threw some new cylinders and springs at it because they are so cheap online, topped up with fresh oil too. Should swap out with no issues. I got a 2nd gen rear rubber line but it looks like the 1st gen will fit fine. Hardlines are different, with the 1st gen having a T-piece and 2 bleed nipples, the 2nd gen has the line going to the LH cylinder and then across to the RH cylinder with a single bleed nipples on the right. Might be a little harder to bleed.

1st gen has duo servo drum brakes, 2nd gen has leading and trailing. Technically the duo servo brakes are more efficient but I don't think it will be noticeable, both have the same size cylinders, I'm not aware of any difference in the master cylinder or bias valve. The diff was on a 2nd gen double cab which is heavier than the 1st gen so I think it's fine. The pinion flange are different shapes but look like the same pcd. The hand brake setup is a little different but should be fine with the 1st gen cable ends

Forgot to paint the drums, so they are drying now. Il let the paint harden up another day

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