I've been thinking seriously about getting a GPS, but later. For now I must achieve my 87 MIIIIIIIIIIIILES PER HOUR whether with the T4 or the B4. I have the RC10L3 though, but I have no interest in running it to such speed..no..no.I would rather take it to an angelic speed over 1500 light years..oops..I bet its a bit tooooo much. Any way I made a change in my plan. I've took out the 1930/5 out of the T4 and I'm going to put it in my B4 (which I've originally decided to make it the vessel that will carry the 1930, but since I didn't have a good ESC for it I bolted it in the T4 along with the 9920) and I will wait for the MAMBA MAXX to come out to couple it with the 1930. As for the T4 I'm going to return the 1920/8 back into it and I might add another cell to my 13.2 volts and make it 14.4 volts pack and might see a change in the behavior of my T4. And about what you said M.Mike I think you are right. I truly ran it extremely hard. I even made the T4 go climbing a pile of sand and stones and the wheels were spinning without making the truck move and I put all the power into the motor to the point where I made a shower of sand and stones( I'm talking true this time) it was truly a scene to be hold and also very scary since one of the stones that were raining almost scratched me. Oh well, wish me luck next time everyone.