1998 GMC Sierra Catalytic Converter EPA Approved C3500 - 7.4L - RWD - 155.5 in. WB - From 8600 To 10000 lbs. GVW - Undercar Unit - Rear guaranteed to replace your current 1998 GMC Sierra Catalytic Converter EPA Approved C3500 - 7.4L - RWD - 155.5 in. WB - From 8600 To 10000 lbs. GVW - Undercar Unit - Rear. 1998 GMC Sierra Catalytic Converter EPA Approved comes new OEM 1998 GMC Sierra Catalytic Converter EPA Approved aftermarket new 1998 GMC Sierra Catalytic Converter EPA Approved of remanufactured 1998 GMC Sierra Catalytic Converter EPA Approved C3500 - 7.4L - RWD - 155.5 in. WB - From 8600 To 10000 lbs. GVW - Undercar Unit - Rear.