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Originally Posted by bigd40
I have been pulling my hair out over this same problem. (Mine is stuck in 4Hi.) I assmed I had a bad relay because when switching, I did not hear relays trip. All relays tested fine. I am now looking for the GEM module. Thanks for the input.
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you are probably on the right track, its located directly behind the fuse block on the driver side ,remove four nuts and you can work it out the back side. some folks have said moisture gets on the gem causing it to malfunction. personally, I have never seen moisture,but it makes sense when wd40 seems to at least temporarily fix the problem. hope it works for you.