* Check the sticker on the driver's side doorjamb: This sticker often lists the axle ratio. Look for something like "Axle Ratio: 3.55" or "3.92" etc.
* Check the build sheet (if you have it): The original build sheet from the factory will list the axle ratio.
* Look at the axle itself: The ratio is sometimes stamped on the differential housing, although it might be difficult to read.
* Consult a Dodge parts manual for 1996 Ram 1500: The manual might list common gear ratios for different configurations, though it won't be definitive for your specific truck.
Without knowing your truck's specific build details, it's impossible to tell you the rear end gear ratio.