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What year and model are you working on ? On your front motor mounts one is getting torque when going forward and the other gets torque when in reverse. So essentially one has a bit more demand than the other. But you still need to make sure that the one that you did not change is not broken and is in good condition.The shaking on the freeway over 60 could be a few different things. A tire could be out of balance or may have a broken band inside. The other thing in mind would be a bad universal joint. And again it could be other things ,but I would have to know what vehicle you are working on.
When you changed your tires were the wheels inspected to make sure they weren't bent. If on of your wheels is bent even just a little it could cause your shake. You could try rotating the front ones to the back and see if it makes a difference. I would inspect your wheel bearings and front CV axles and joints. If one of those it bad it will cause your shake.
A 6 cylinder is an interference fit engine . Chances are you bent some valves IF the belt slipped.
Mounts usually don't make a vehicle shake as you described.
I believe the milage intervalfor timing belts is every 60 thousand.