paratrooper166

I have read exstensivley throughout the forum trying to run down the vibration in my 06 FX4 (143K). It started as a low end vibration during decelartaion coming to a stop. Now it seems to have advanced into shuddering / vibration during accelaeration between shifts while warming up. It does get better when I let off of the throttle and when it heats up.
So far I have:
1. Replaced all plugs
2. Replaced front ujoint on driveshaft (had some play in it)

It only seems to habppen in a straight line so I am ruleing out the clutch pack issue. So I guess I am looking at either doing a full trans flush next or replacing the colis. Any help would be great.