This Overhaul Kit contains Pistons made of hypereutectic aluminum alloy, which makes the piston inherently stronger. It is also more resistant to expansion and contraction, as well as scuff and corrosion resistant. Efficiency improves due to a better seal between the rings and cylinder wall.Includes: (6) HCTRE23160HC Cylinder Kits (6) HCTAR45723 Rod Bearings (6) HCTAR74814 Main Bearings (1) HCTAR77747 Thrust Washer Set (1) HCTAR77748 Thrust Bearing (1) HCTAR63938 Overhaul Gasket Set (1) HCNAR49025 Front Crank Seal (1) HCNRE520036 Rear Crank Seal (6) HCTR30939 Piston Pin Bushings (4) HCTR46903 Cam Bushings (12) HCTR66452 Connecting Rod BoltsThe HCTRG17897HC High Compression Major Overhaul Kit, John Deere 6-404D Diesel Engine fits equipment brands such as: John Deere