Your best bets are:
* Ford's Parts Website (or a dealer): The official Ford parts website (or a local Ford dealership) is the most reliable source. You'll likely need your truck's VIN (Vehicle Identification Number) to get the exact parts diagram for your specific differential. The VIN will identify the axle ratio and any specific options impacting the differential.
* Online Auto Parts Retailers: Major online auto parts retailers like AutoZone, Advance Auto Parts, Napa Auto Parts, and others often have online diagrams. Search their websites using your vehicle's year, make, model, and engine. Again, the VIN might be helpful to ensure you get the correct diagram.
* Repair Manuals: A comprehensive repair manual for your 1999 Ford F-150 (Haynes, Chilton, or a factory service manual) will contain exploded diagrams of the front differential. These are usually more detailed than those found on parts websites.
* Online Forums: Ford F-150 owner forums (like F150online.com or others) might have members who have shared diagrams or can point you in the right direction. Be aware that information found on forums may not always be accurate.
Important Note: The exploded view diagram will be very helpful, but remember that working on a differential is a complex task. If you lack experience with automotive repair, it's best to seek professional help. Incorrect assembly can lead to serious damage and safety risks.
