I'm not an od trans specialist but from everything I've read Redfish is correct about the early ones having oiling issues so you want a 90-95. If I'm not mistaken 96 is when they started with the electronic shifted units. Wish I could say if the ones in a Ram truck or van are heavier duty but I haven't been into them so I'm not sure but I'd say if you can find one from one of them it's a better chance that's it's heavier