2970S Sidehill - 18% Slope Compensation- For John Deere 9650-60-70, 9760-70, & 9860-70 STS combines. The Hillco Leveling System moves the original transmission-to-final-drive assembly from the combine's main axle down to the leveling system's undercarriage. There are no extra or non-stock drive train parts, and the results are impressive. This efficient and reliable design keeps the tread face of the tires flat on the ground for increased traction and stability.