and go ahead and pony up for the Robinson racing harded almuminum and steel tranny gears. I had hell with the plastic ones after i converted my t-maxx to a big block.

And you do know that just sticking a big block in wont increase top speed right? It will deffinatly increase torque, but you will need to regear to take advantage of that torque, or else the big block will yield no results in the speed department.