* 8.75-inch: This was a very common rear axle size for light-duty trucks of that era.
* 9.25-inch: A slightly larger and more heavy-duty option, often found on higher payload or optional equipment trucks.
To determine the exact size of the rear axle in a specific 1987 Dodge D100, you need to check:
* The Vehicle Identification Number (VIN): This will give you the most accurate information. A VIN decoder can translate the VIN to provide details about the truck's specifications, including the rear axle.
* The Data Plate: Located in the driver's side door jamb, the data plate might list the rear axle ratio (e.g., 3.55, 3.91), which can indirectly help identify the axle size. However, the data plate may not directly list the axle size.
* The Axle Casting Number: The number is usually cast into the axle housing itself. You'll need to look underneath the truck to find this. This number can be cross-referenced with online resources or parts catalogs to identify the axle size.
Without one of these pieces of information, pinpointing the exact rear axle size is impossible.
