Transmission Oil Cooler For Chevrolet Silverado 2500 HD Heavy Duty GMC Sierra

2004-2006 Silverado 2500 HD WT Allison, 5-Speed, Automatic Transmission, External Oil Cooler, 13.25 x 5 x 1.25 in. 2001-2005 Silverado 2500 HD Base Allison, 5-Speed, Automatic Transmission, External Oil Cooler, 13.25 x 5 x 1.25 in.