Thanks man. You have helped me a lot. Anyway got the 1515 in it today. 48/16 gearing and I only had to do some minor modification to the side chassis. Gotta love hammers. LOL.

Just gave it a run in the street. Some people like to approach this kind of thing scientifically and calculate the gear ratios and what not. Not exactly my style. Instead I just whacked 4S 5800mAh 30C Zippy lipos in it and gave it full throttle. Ended up slamming into the gutter but other than some cosmetic damage to the wheels everything is fine. It has stupid amounts of torque and speed is just right with the chosen (what I had in the tool box) gearing. I was a little worried about the stock Chinese ESC holding up but it seemed like it wasn't phased at all. Temps on the motor and the ESC were in the 100F (+ or- 5) and batts were even lower after doing speed runs and little bit of grass driving in the street. Couldn't be happier.
Only thing I did notice is that the caps on the ESC were getting pretty warm. About 135F. The ESC seems to be cool like I said above but it's just the caps that are getting warm. I wonder why? Maybe they are crappy caps or could it be something else causing them to heat up. (batteries?) Might put on a few extra ones and see what that does.

Anyway might throw up a pic or two if it is OK with you Gee. After all it is your thread and once again thanks for the help.