Tristan

I am relatively confident the box I have does include the reverse lockout. I have the workshop manual, and the ones with the lockout have a diamond-shaped plate on the passenger side with two 10mm bolts. I have only looked through the shifter hole, and I think I can see that plate/bolts. The car is a 1979 model though. I cannot shift into reverse from any starting position (tried neutral, 1st, 2nd, 5th). I'll check the shift bushings next, like you said, very easy to get to. If that yields no result, then I'll try get to the reverse lockout plate, undo the bolts, slide out the mechanism and check for issues. The only tricky part is getting to those bolts without removing the box as they are almost directly above the transmission mount. Note: I am yet to drain/replace oil in the box. I appreciate all the help and info 🙇‍♂️

@Muzez I just picked up a 280ZX and has the exact same problem, unable to shift into reverse. 1 - 5 feel fine. Was there anything specific that allowed you to get to reverse? Did you fiddle with the lockout mechanism? Or when you removed the gearbox did it just come good somehow? Thanks!