Sheddy - you wont have a problem mate.
I run a 5.5t in my Cat on Speed Power 5000mAH 55C lipos and I get two races out of them if I had to. After 10 minutes they still arent near the lipo cut off of 3.6v per cell that I have set on my ESC.
Race on buddy!
@RogerM - something queer going on. You arent getting the capacity rated on those batts, or maybe the high C rating of your cells is sucking the amps out quicker? Either way, thats the fastest dropping batteries Ive heard of. 4WD doesnt take that much more juice than 2WD in mine (and the other guys I race against) experience.