The alignment on my truck must have been knocked out of whack and as a result, the inside edges of the two front tires are worn to the point of needing replacement. The rear tires are still in good condtion. Will I damage the transfer case if I only replace the fronts? The current tires are Firestone Firehawks just like the ones that came with the truck. These tires are no longer available. I talked to a local tire supplier and he is very hesitant to sell me two tires for an all wheel drive vehicle. Are his concerns legit or is he just trying to sell me tires I don't need?