I just bought a 1994 Plymouth Sundance duster with a 3.0 and a manual transmission. It shifts into 1-4 and reverse just fine but no 5th gear. The shifter will go into and stay in the 5th position but it won't engage at all, as if still in neutral. Has anybody dealt with this before or have any suggestions on where to start? I'm fine at working on cars but not the best at diagnosing. Thanks in advance!