Well, it looks like I'm going to do the the ole "Zx turbo in the 280Z" thing. I'm fortunate enough to have several 5 speeds, from various years, to choose from. What I don't have is a 82 non-turbo tranny. I understand that they have a reverse lock out, to prevent accidental "tranny detonation" (not good) caused from hitting reverse when down shifting from 5th to 4th in racing situations. I do, however, have an 81ZX non-turbo 5 speed that's in great shape. My question is......does the 81 have this same safety feature? Thanks in advance.