What is the lug pattern on a 1978 ford bronco?

The lug pattern on a 1978 Ford Bronco depends on the wheel size and options chosen when the vehicle was manufactured. There wasn't a single standard. You'll need to check the wheels themselves or the owner's manual (if you have it). Common lug patterns for that era Bronco include:

* 5x5.5" (5 on 5.5 inches): This was a very common pattern.

* 5x4.5" (5 on 4.5 inches): Less common but possible, especially depending on optional wheels.

To find out definitively:

1. Check the wheels directly: Look at the wheel itself. The bolt pattern should be clearly visible.

2. Check your owner's manual: If you have the original owner's manual, it will specify the lug pattern.

3. Check the spare tire: The spare tire will have the same lug pattern as the other wheels.

4. Consult a Ford parts website: Input your Bronco's VIN (Vehicle Identification Number) into a reputable Ford parts website. This will often provide the correct specifications.

Without further information about your specific 1978 Bronco, it's impossible to say for certain which lug pattern it has.