Its very possible that you did damage the transmission by a combination of running it on low or empty fluid and having the 35" tires on there. I've heard of people having some transmission problems down the road by installing wider diameter tires because your essentially changing the entire gear ratio and the transmission, which is built to run stock 31" (or similar tires), has a harder time getting those bigger tires rolling from a dead stop. Couldn't tell you for sure though. Seems like a pretty low mileage for transmission issues. Get a diagnosis from a ford tech, they do an awesome job of diagnosing ford problems for obvious reasons... they also do a number on the wallet though so if it is a transmission, I'd have it done somewhere else. However, if its something simple such as a bad spark plug, it could be just a DIY project.
Last edited by Ford-guy; 04-21-2014 at 12:26 AM.