This is the rear end, differential vent hose by Spicer. This item fits many different GM vehicles from 1990-2009. This fits 1997-2009 GMC Topkick and Chevrolet Kodiak T6500, T7500, 2004-2009 GMC Topkick and Chevrolet Kodiak T8500, 2003-2009 GMC Topkick and Chevrolet Kodiak C4500, 1990-2009 GMC Topkick and Chevrolet Kodiak C6500, C7500, and 2003-2009 GMC Topkick and Chevrolet Kodiak C8500 trucks. This tube mounts on the rear axle differential and vents to the atmosphere. This hook shaped hose comes with the clamp. This is the tube ONLY, this is NOT the entire vent kit. Replace your old, cracked, or missing vent tube with this brand new factory original part from General Motors at a fraction of the dealer price.

New. Never Installed. OEM Part. Bulk Overstock

GM Part # 15739580

Alternate Part #'s 129339 ; 507162 ; 12375507

Item is number 3 in the GM diagram.

http://www2.dana.com/pdf/APSL-0016.pdf