New member. I cant believe I have this thing in my driveway!

[Busted Knuckle]

If you're in Austin, TX which I assume based on your profile, Jefferson Bus in OKC is a good close parts and info source.

Call Ed in Parts at 800-813-9367. He really knows GMCs.

Gus,
First remember that yer not suposed to assume things. And I thought Ed retired.
Maybe not, but I know whoever it was I used to deal with over there did, but I don't remember if it was Ed or someone else. I know I have spoken with Ed many times, and yes very knowledgeable and helpful. (once he drove over to an OKC hotel and picked up an Eagle steering column core from a driver on a Sunday for me.)
  BK