I have a 79 GMC Jimmy 4WD and am trying to figure out what transfer case I have. It looks like the NP203 picture on offroad designs website but the speedometer cabel attaches on the opposite side. ORD says that the NP203 is a full time case but my front driveshaft does not spin when driving and I have never installed a part time kit. My gear selector is labeled (front to back) Low Loc, Low, Neutral, High, High Loc. This is also the way the NP203 was geared according to ORD. I am thinking 203 but what about the speedometer cable and no power to front shaft unless in 4wd. Any ideas?