I got a 2006 Jeep WK limit 5.7L. I just replaced the rear end and thought this was symptom related to a bad differential pinion. A lot of symptoms went away, but I wonder now if this one is a separate issue. Perhaps u joints.
At highway speed, say 65MPH, and with just the right RPMs to maintain that speed (say 1900 or whatever), there is a jolting sensation running through the vehicle like train cars banging into each other. If I let off the gas and let it coast, it goes away.
This happens at any speed. It's just worse at high speed. I haven't driven it much to avoid this growing into something bigger. The driveline feels sturdy and intact, but it's like when the ratio of speed and power are just right, I get that back-and-forth shuddering.
At highway speed, say 65MPH, and with just the right RPMs to maintain that speed (say 1900 or whatever), there is a jolting sensation running through the vehicle like train cars banging into each other. If I let off the gas and let it coast, it goes away.
This happens at any speed. It's just worse at high speed. I haven't driven it much to avoid this growing into something bigger. The driveline feels sturdy and intact, but it's like when the ratio of speed and power are just right, I get that back-and-forth shuddering.