1. Immediate Action:
* Stop driving immediately: Driving with a leaking differential can cause serious damage to the differential itself, leading to complete failure and potential loss of control of the vehicle. The low fluid level could lead to overheating and catastrophic failure of the differential gears.
* Park on a level surface: This prevents further fluid loss and makes inspection easier.
2. Identify the Fluid:
* Check the color and consistency: Differential fluid is typically a thick, darkish-brown or reddish-brown. If it's a different color (e.g., bright red like transmission fluid or clear like power steering fluid), it suggests a different source of the leak. This can help you pinpoint the exact issue.
* Smell the fluid: Differential fluid has a distinct smell.
3. Assess the Severity:
* How much fluid is leaking? A small drip might indicate a minor seal problem, while a significant leak requires immediate professional attention.
* How long has it been leaking? The longer the leak has been present, the more damage might have occurred.
4. Seek Professional Help:
* Tow your truck to a qualified mechanic or Ford dealership: Do not attempt to drive the vehicle until it's been inspected and repaired. The best approach is to have it towed to avoid causing further damage. Repairing a differential is a complex job requiring specialized tools and knowledge.
* Explain the problem clearly: Provide details about the leak (amount, color, consistency), when you noticed it, and any other relevant information.
Possible Causes (Don't attempt DIY repairs unless you are a skilled mechanic):
* Seal Failure: The most common cause. The seals around the yoke wear out over time and may leak.
* Damaged Yoke: A damaged or bent yoke can also lead to leaks.
* Differential Case Crack: Less common, but a cracked differential case would require more extensive repairs.
* Loose Bolts: Sometimes, loose bolts on the differential cover or elsewhere can be a cause (though less likely to cause a leak directly from the yoke itself).
Do NOT attempt to fix this yourself unless you have significant experience working on differentials. Improper repairs can lead to further damage, potentially costing you significantly more money in the long run. The safety of yourself and others is paramount. Professional diagnosis and repair are highly recommended.
