GMC Troubleshooting Questions? Ask a Mechanic for Answers
What you can do is since those years are spring loaded you can lay under the vehicle, pull down on the front cable it will come out about an inch, clamp the cable where it comes through the guide in the front. This will give you slack to remove the rear cables without having to remove the rear wheels. From there you can then remove the intermediate cable from the retainer.
its been awhile since I done one but it may even be longer than a inch of slack available. You can pop the cable off the mechanism if needed. it just sits in a pocket on the assembly.
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