I have a 1998 GMC Sierra CK1500, The tailgate will open.

SOURCE: tailgate stuck, closed on right -not latched on the left

sir ur problem is pretty complicated... so i have given links where u can find step by step process of solving this problem..

http://www.dmcnews.com/Techsection/doorstuck.html


or if u need manuals particularly repair manuals visit these websites

http://www.autopartswarehouse.com/mmp/gmc~envoy~repair_manual~parts.html


http://www.partstrain.com/ShopByDepartment/Repair_Manual/GMC/ENVOY

SOURCE: Tailgate latch will not release

Sounds like you have a bar disconnected inside the hatch. You may also need a latch itself. Does it lock and unlock? If it does, most likely a bar off issue. Will be a pain to get the cover off with the door closed, but you will need to remove it to inspect.

SOURCE: 2000 GMC Sierra tailgate won't unlatch on right

You should be able to pry it off. Be careful, if you break the latches when it pops off you will have to replace it. Look on the opposite side of the tailgate and there should be a plate screwed to the tailgate. It is almost the size of the tailgate.

SOURCE: the rod right hand side of tailgate is not attached

You should be able to feel around and locate that rod. After you get it you can use some pliers or vice grips to put on the rod to release the lock on that side and the handle on the other side.
As long as the locks and the rods move freely and are in good shape then all you will need is a new handle asm. It will come with new clips and on the other side of the tail-gate are 3 torque-head screws that will need to be removed to replace that handle.

SOURCE: Tailgate won't open on 1994 GMC sierra c1500

Check to see if you can take out the tailgate handle and see if the unit is still connected to both arms that moves to release the pins are still connected and or broken.