While cruising in neutral it sounds as if my clutch is grinding on something, rattle noise. The noise is orthodox to the speed at which I'm going. I had bought the z with a short throw shift installed by previous owner. Not sure whether or not this will take its toll over time or should just be brushed off for now? Any advice would be amazing!

 

hopefully English is your second language. If not your post is atrocious. You can't cruise in neutral. Perhaps you meant coast. Noise usually means throw out bearing is shot. Need to drop the tranny to find out. while there might as well replace clutch, throw out bearing, clutch fork fulcrum pin, pilot bearing. Never hurts to replace the input bearing on a z31 tranny
if you would really like answers that would help you and avoid flames give the following info when you post: year of car, n/a or turbo engine, stick or slushbox, digital or analog dash. Most of us can tell by the year what model you have ie 85T is a turbo z31. Z cars come in many flavors and they are all different. example 84,85,86 Z31's pretty comparable. there were changes in 87,88,89. in addition 300ZX can refer to two completly different cars the Z31 and the Z32. No mindreaders here the more info you can post the more likely you get a cogent useful answer. The cars with L engine (straight six) changed almost yearly from their introduction. A 240Z and and a 280Z have similarities but they can also have wide variance.

 

@ rogerz hopefully your second language is English. Missed capitals everywhere! And we're in the Z32 forum - omgosh!!