Hey guys. ZX is in the shop for a few major things. First, I drive a 81 280zx NA, completely stock. Transmission needs replacing, and apparently the differentials just broke too yesterday. As down and out I am about this, I figure this is a good time to upgrade those two parts to something a bit better. By upgrading, I do mean something better than stock or that will enhance the performance. So, what should I look for as far as replacement parts that are upgrades compared to the stock 81 stuff? Any suggestions will help guys thank you!!