Newbie question: Vibration after Lift Kit install

I just recently installed a BDS 3 1/2" lift on my
YJ and upgraded to 33" Procomp Mud-terrain
tires.  After about a month of driving, I noticed
a vibration which seemed to be coming from
the front right wheel whenever I was turning right
and going up a hill.  After about 3-4 months,
the vibration seems to be coming from both
wheels and only happens when I first start
to come up to speed (in first gear).  I checked
all of the torques from my install (including my
lugs) and can't figure it out.
Anybody have any insight?  I don't think it's
 a drive shaft problem - but I'm still just
a newbie.

Any help would be greatly appreciated.

Thanks,
Mike