I have a 1993 Mazda B2200 2wd 5 speed. Today I went to back up in dry grass on a slight incline and slipped. I am used to having a 4wd. I was wondering how a rear diff lock would work and what type of diff locks are options. I understand at the end of the day its still a 2wd drive but just looking for a little more traction without sacrificing to much.