Yep.
Though what's required will take some research. There is a CS calculator at CS Junkies, so you know what combination of pulley sizes you are contemplating will work, and what ratio they are, when installed on you chassis. The problem I see with the TA06, is the center pulley mount doesn't allow for larger pulleys, and the pulley for the front diff is already as big as it can get, and the rear pulley on the spur gear mount can't get much larger, also.
Like I said, if you go to CS Junkies, there's an article on a CS'ed TA06 that turned out very nice.

I'll post something on your TA06 thread, concerning this, if you like.