A bad check strap will make quick work of the hinges on a two-door, so I recommend you fix it soon. Even when it's unbroken, the momentum of the heavy door tends to extend the door far enough to hit, not the stop of the check strap, but the stops that are built into the hinges. When this happens, the hinges flex outward, and eventually they tear away from the body. This is a real pain in the you know what, and requires welding. Four doors are less afflicted by this, simply because the doors are lighter and tend not to swing so hard when you open them.
Look at the hinges when you open the door. If you see them flexing outward, your check strap is not doing its job, either because it's broken/worn out, or because it has bulged out the frame of the door itself, or perhaps because it was designed about a quarter inch too long. There should be a shorter one for two-doors but there isn't.
One thing you can do that helps a little, especially if the door itself is a little stretched out where the strap bolts in, is to put a couple of washers on the studs that mount it to the door. They're long enough to accommodate this. This will effectively shorten the check strap and help prevent hinge stress. If you're really ambitious, you can also weld shut the hole in the strap at the body end, and redrill it further in. Grind to shape, and you've got a custom 2-door strap. I did this on my stepson's 2-door after the THIRD rewelding.
