What year durango had a 9.25 rear diff with a trac-lok unit ?

 

trac-lok as in Limited Slip? if that's the case then all 1st gens had them as a option.

 

Yea but how do you know if it had without pulling the diff cover ?

 

inside the glove box there should be a sticker that will say it. if not you will have to jack up the back end and spin the tires. I always get the ways they spin confused but i think in the both spin the same way its LSD.

 

Jack up the rear end. Rotate the rear tires, do both tires spin the same direction? If they do, then you have a LSD rear end. If they don't. Then you have what is called an open differential.