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1st Gen Ram Tech'93 & older Rams: This section is for TECHNICAL discussions only, that involve 1993 Rams and older. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
Jack both wheels off the ground. Turn 1 wheel by hand and note which way the other wheel turns. If they are both turning in the same direction you have possie, if they turn in opposite directions no possie.
There is one flaw with judging anything on the vehicle, especially possie via what is on the build sheet. Unless you are the original owner you can't be sure the differential is original equipment. In this case if it had been changed to possie and you put in the wrong fluid you would destroy the differential. We must remember that we are dealing with old vehicles that a lot of people like to modify. This is why the build sheet is a good starting point but you must verify the information unless you are sure that the part is original to that vehicle.