I don't believe we have that on 5G and 6G Rangers. We have live axles, meaning they are always engaged. Gen 4 had PVH, pulse vacuum hubs to lock the axles. Royal PITA as they rarely worked when you needed them. That's why many removed them and installed manual locking hubs.I didn't see your response to other suggestions/ideas posted, so I'll chime in with my thoughts.
I sold my Ranger due to a vibration that the dealer claimed they could not duplicate. Looking back, it happened when temps were below freezing (I didn't make that connection, and the dealer didn'tgive it a serious look until warmer weather). It occurred at all speeds, but was more pronounced above 45 mph. Doing my own research after selling it, I think it is the same issue found on earlier F150s due to the Integrated Wheel End not fully disengaging. Those are vacuum accuated, so a vacuum leak or valve failure.
I did a deep dive on the operation of the IWE and wish I did that sooner. If this sounds familiar, search for IWE problems on F150.
That actually makes me feel better, as that means I didn't miss the chance to offer repair suggestions to my dealer.I don't believe we have that on 5G and 6G Rangers. We have live axles, meaning they are always engaged. Gen 4 had PVH, pulse vacuum hubs to lock the axles. Royal PITA as they rarely worked when you needed them. That's why many removed them and installed manual locking hubs.