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So I have a 1985 GMC Sierra 2500, my issue is that going down hill if you step on the clutch to change gear the transfer case automatically changes to 4x4 low, which I can tell you is quite the surprise. If any one has any ideas they would be greatly appreciated. I think there is a faulty gear in the transfer case but I'm not sure which one it is, or which ones. Thank you for your help.

EG

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