twall --> thanks for the input
We are defintely tuned into the stay safe mentality. Any further mods would mean helmets and such.
After doing some research it doesn't look like we would be too competitive in the pulling unless they have special classes for lawn style 'belt driven' tractors.
The rear tires came off the shelf at Tractor Supply. They also have a great selection of pulleys & belts! We aslo have a couple of local bone yards to sift thru for great used stuff as well.
I guess the main reason for this build is to spend time with my 15 year old son. The pulling & mudding are secondary for me.
I'd like to research the carburation on the briggs & stratton 14hp opposing twin cylinder motors. It may be an easy way to increase the hp.