Tires: all wheel drive tire sizes, mud and snow tires, tire placard

Question
Approximately 6 months ago, I had 4 new tires installed on my 2000 ford explorer. I paid for four (4) 235 75 R15 tires. The dealer installed one of the correct size on the front passenger side, and 3 incorrect 215 75 R15 tires on the other three. I put approximately 10,000 miles on the vehicle in the interim. From the day the new tires were installed, there was excessive noise, and my gas mileage decreased by approx. 20%. I was told the noise was due to the heavy tread on the mud and snow tires I purchased and that was causing the decreased mileage as well. My vehicle broke down a couple of weeks ago, and it is the front drive train. I also have leaking seals in the transfer case. How much damage could have been caused by this tire issue to my drive train? I have filed an insurance claim with the tire installation company and the vehicle is currently undergoing diagnosis at Ford. Should the tire company be liable for repair costs? The vehicle had no major issues prior to the new tires and all maintenance from the day it was bought was performed at Ford with exception of tires.  

Answer
Todd,

The tire issue could have caused the drivetrain failure.  The tire dealer should be liable for the repairs.

The way to approach this is to find on the internet statements from tire manufacturers and vehicle manufacturers that AWD and 4X4's need to have 4 identical tires.

Then take a photo of your vehicle tire placard, and photos of the tires with the tire size clearly visible.  Compare that to the receipt.

You will also need an estimate for the repair stating that the drivetrain failed due to XXX and that this could have been caused by the differences in diameter.

Then approach the tire dealer in a calm and forthright manner stating that you expect him to pay for the damages.  If he refuses, tell him you are going to get the vehicle repaired and file suit in small claims court for the cost of repairs including rental car while the vehicle is repaired.  If he still doesn't budge, then do it.