2001-2020 Heavy Duty PTO Side Covers Allison 1000 And 2000 Series Raw (128060000)Description Made from cast aluminum, these covers add strength to center of the transmission case eliminating trans oil seepage at the mating surface. Cooling fins double the surface area (60. 74 sq. in.) when compared to stock (30. 62 sq. in.), which increases heat dissipation from the transmission oil. Kit comes with the covers, mounting hardware and gaskets. Applications: Note: Features Heavy Duty PTO Side Plate Covers GM (128060000) Ridged design