Hello everyone I just joined the forum today. Looking forward to talking with f100 enthusiast like myself. Forgive me if this question has been ask as I haven't been able to find anything on the internet. I'm wondering if a 66 f-100 longbed box will fit on my 63 longbed frame? Any input will be much appreciated. Thanks!

 

The wheelbase are totally different. Your 63 wheelbase is 122 inches. The 66 wheelbase is 129 inches. Your wheels would he underneath the front of the bed rather than the wheel opening. Welcome to the fte forum by the way. Please let us know what state you're in as there are many of us around the country helping out other enthusiasts like yourself with any questions you might have about your truck. Lewis