Can anyone tell me the gear ratio (need to replace my rearend) in a 1991 2dr 2wd Geo Tracker and a 1995 2 dr 4wd Geo Tracker, I want to swap the 1991 to the 1995, but i'm not sure if they will match up? Or maybe a rearend from a diff. vehicle is compatable with my tracker...im lost...HELP! Please =)