Intermittent grinding above 45mph

[Fly]

Anyone have ideas what could cause an intermittent light grinding feel coming up from the floorboards when driving above 45mph? It isn't rhythmic, or rotational related. Happens for short bursts less than a second. It doesn't seem related to acceleration/deceleration/turning. I brought it into the dealer and they say everything looks ok and blamed it on tire noise. I was thinking it felt like a driveshaft occasionally rubbing against something. 2dr BB SAS with the 2.7

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[Lcubed]

2H or 4A when this happens?

 

[Fly]

2H or 4A when this happens?

Both, no difference between the two

 

[23BDBigSean]

Both, no difference between the two

Did you ever find an answer to this issue?

I’m having a similar issue- also a 2.7 with SAS takeoff suspension. It is an intermittent vibration/rubbing that happens whether I’m accelerating or not. It is constant and happens every 1.5-2 seconds

 

[Fly]

Did you ever find an answer to this issue?

I’m having a similar issue- also a 2.7 with SAS takeoff suspension. It is an intermittent vibration/rubbing that happens whether I’m accelerating or not. It is constant and happens every 1.5-2 seconds

Dealer couldn’t find any issue so that didn’t help. I wound up taking it off road and giving it a good workout using 4L and that seemed to cure the issue. It stopped happening shortly after that. I’ve put on ~20k since then and no problems. In hindsight it seems the issue was inside the transfer case.

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