* Ford 9-inch: This was a very common and durable rear end used in many Ford trucks of that era. Various gear ratios were available.
* Dana 60: A heavier-duty option, often found on higher payload or 4x4 models. Again, gear ratios varied.
To know for sure which rear end is in *your* specific 1987 F-250, you'll need to:
1. Check the vehicle's documentation: The original window sticker or owner's manual might list the axle type and ratio.
2. Look at the axle housing itself: The casting number on the differential housing can be used to identify the axle type. You'll likely need a reference guide or online database for Ford axle casting numbers to decode it.
3. Check the VIN: While the VIN won't directly state the rear axle type, it can be used in conjunction with Ford's decoding charts to determine the original specifications, which might include the rear axle.
Without more specific information about your truck, it's impossible to say definitively which rear axle it has.
