Acceleration suffered quite a bit, but you can get stupid ground speed running a Picco 28, Terra Pins, 18/47 gears, two speed and a 086 pipe...
http://www.youtube.com/watch?v=ExDPpRdj_Vg
A fellow member said his truck ran fine on Terra Pins with 18/47 gears, not sure what fine was, but I found it to be too much gear.
On the other end of the scale, you could run a stock Picco 28, a three speed, 17/47 and an 086 in an X chassis and flip it on it lid whenever you wanted to....
http://www.youtube.com/watch?v=c3VAeFc7_uw
Glen