Pulled my D17 Diesel yesterday. 4500lbs 6 mph and 8 mph. Motor running good. Pulled in 2nd hi. 18.4X38 cut tires. Chart says 9 mph at 3000. Problem was tires stopped turning at end then started again. Still got 4th in 6 mph. Probably over 15 tractors. USAP at Princeton In. How can I tell which is slipping. Or will the two speed never take 250 hp. When I drove out the door and pushed the clutch in. The tractor stopped. Like brakes were on. I moved hand clutch to neutral then to low then to hi. And problem went away. Thanks for any help.