Ive run into this before with a Nissan xterra. It was heavily modified but i had a rear axle leak at the wheel hub. They said my after market wheels voided the warranty on a solid axle seal. It did have a lift and bigger tires, but no geometry with regards to a seal was changed. I was also running factory diff fluid. I did actually qoute the MM act, they talked about it for a while in the back, came out and said sure we’ll cover it. Fast forward 7 years with the Raptor, they didn’t want to warranty a broken front diff because they said I had had an impact. They couldn’t show me where or what signs of impact damage there was, but refused to cover it. They actually suggested I commit insurance fraud and call my insurance company. These dealer interactions can go both ways is I guess what I'm trying to say. Ill never do business with Tomball Ford again.