More than likely, What you have is the Weld coming apart from the body frame. Check : With the door open,try to watch the seam where the hinge braket meets the body frame, You will probably see a crack opening while you lift up the open door. The weld has failed,just like on both my doors.
You can fix a sagging door on a 1996 Suburban by replacing the door pins and the bushings.
i dont know but it is realy hard to do that take that to a machanic and see if they can do it
With the Steel cross bars
Replace hinges.
I have a great door seal that will help fix most garage door problems. It is called a Snirtstopper. Take a look at it at Snirtstopper.com Thank you, MB
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get a hinge replacement kit for that door. its the door sagging NT the latch.
check your engine
like this.... http://www.youtube.com/watch?v=SVVozUkfDO4
May have to take the truck to a certified speedometer repair shop
Remove door panel and replace latch mechanism
Check the door hinges they may need replacing riveting or welding,do it soon or you may cause further damage