I saw a 6000 pull at a county fair 30 years ago. It was balanced just right, tires about 8 inch off the ground. The operator worked the throttle and transmission just so, brake pedals just so. Idle down gain traction power up, shift down etc. Got another 10 feet and 2-3 minutes worth of show. That was the first Ford I had ever seen pull, and the most skill ever.
If your machine works well, perform the maintenance and keep it.