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I just got my truck back after 6 weeks at the dealer. I took it in because when it was in 4wd the front end sounded like it was going to self-destruct. The tech replaced the T-Case and front driveshaft. He then test drove it and found that some noise was still present. Ended up swapping out...
I thought I would post this in case anyone needs it. I started with a diagram from a 2018 that I found online. The 2018 diagram didn't match mine so I just rang out the wires. Based on ASCM PN's I think there was a change in 2020. So this is probably good for 2020+ factory rear air...