So my 75 280z 5 speed has been parked for a couple of years now. I don't drive it, once in a while I'll start up the engine and let it idle for 15 to 20 minutes. Recently my nephew came and wanted to test it out, when he shift the car into reverse it grinds and won't go into gear. I know the tyranny are hard to come by now and a rebuild would be costly to. What are my options or were to check to make sure it's the actual tyranny that is bad. I did remember reading on here few months ago about a post and a member said he had the same issue and has something to do with the clutch slave cylinder or something.