nismo_z31

Alright I own an 1986 n/a and its got kind of a problem that no one can seem to diagnose for me...maybe someone here has had this same problem and can help me out.

When I go out to my car and start it up for the first time (either day or night), I start it, and usually have to put it into reverse because of where I am parked, and when I put it into reverse there is this noise, sort of a clunking noise (not quite clunking but a little higher pitched than that)...Its been going on for a while and no one can help me. It seems to be comming from somewhere in-between the transmission and the engine....any help would be extremely appreciated....or maybe someone could point me in the direction to have to diagnose it myself....

b300z

has anyone checked the gearbox?
i had a clunking or rattling noise in my last car, and the mechanic said there was something in the gearbox rattling around