Part Type: Accessory Drive Belt Tensioner Assembly. 1999 Ford F-250 Super Duty Engine: 5.4L V8; Smooth; w/o A.C.;. Fits 1999 Ford F-250 Super Duty. Belt Type: Serpentine. To confirm that this part fits your vehicle, enter your vehicle's Year, Make, Model, Trim and Engine in theCompatibility Table.