Was under the new beast today while it was getting outfitted with the aux. fuel tank & 5th wheel. For those of us who have lived thru the 75 m.p.h. vibration on the 4.5's, guess what?!?! No more 2 piece driveshaft or carrier bearing. That is one HUGE driveshaft!!
Also noted a heck of alot more insulation, sound deadening and weatherstriping on the 07 compared to my 04.5. I think they changed the top of doors as they stick up past the roof a little. Not that I want to see anymore snow, but I think they may have eliminated the "snow in the lap" problem when opening the door. I don't mind waiting til next winter to find out for sure.
The more I look, the more I like the improvements on the 07.

 

my 06 has a single driveshaft, is it the same as the 07 6.7l then?

 

sorry, you will still have some snow in the seat. Not too bad, but enough to wipe it away!

 

My '06 has two!

Long box, that is!

Tony

 

i am a short bed, i think that is why i only have a single driveshaft. im just happy i dont have a carrier bearing to worry about!

 

I was told short box=1 piece drive shaft while long box=2 piece shaft and the carrier bearing

 

My 07 LB has a one piece HUGE driveshaft. Looks almost 2x the diameter of the 04.5 two piece driveshaft.