I built a prostock tractor, using a 456 genesis engine, bored to 480ci. I used a ford 5000 trans and rear axle, had to make a billet input shaft, 3disc clutch, custom roll cage and a 8970 genesis hood. Starting to build a new 3 charger alky tractor this spring. The 9600 can get alot lighter, need to get rid of the cast wheel centers in the rear, loose the top cover and 3point. A friend of mine is building an 8000, he is trying to get it down to 8000lb class. He is using a 474 truck engine, pro farm cam and a columbus p-pump, he is just waiting to see what turbo options he has.