When a 5R55W, 5R55S or 5R55N pump is leaking or being rebuilt, having the o-ring, bushing, lip seal and gasket sourced as a single shipment keeps the job moving without waiting on backorders from multiple suppliers. What separates this set from a generic assortment is the specificity of each component: the front lip seal is viton, carries a deep lip geometry and includes the flange for the c-3 front position, which is the spot most likely to give trouble if a standard-profile seal is reused.This is an automatic transmission pump rebuild set covering four pieces total. The first is the pump cover o-ring for 5R55N [99-UP] applications. The second is the pump bushing, also for 5R55N [99-UP]. The third is the c-3 front viton deep lip seal with flange, which shares fitment with the A4LD, 4R44E and 4R55E family in addition to this application. The fourth is the pump gasket for 5R55N [99-UP]. All four are assembled here, counted against the parts list, and that same list ships inside the box so the technician can verify contents on arrival.This set does not include clutch packs, steels, Automatic Transmission Filter, bands or any component outside the four pump parts described. If your repair requires those items, they need to be sourced separately. The listed year range for this set is [02-ON] covering 5R55W, 5R55S and 5R55N. Confirm the code on the actual unit and the model year before placing the order, since transmission codes do not always match what the vehicle documentation shows. Total assembled weight is 1 lb. Rebuilding the pump section of a 5R55W, 5R55S or 5R55N unit goes smoother when all four pump components arrive together, saving a separate search for each piece. This set does NOT include clutch discs, steels, Automatic Transmission Filter, band or any other internal components beyond the four pump parts listed. Verify your full parts list before ordering. The front lip seal in this set is viton material with a deep lip profile and includes the flange, designed for the c-3 front position where standard seals are more prone to leakage under pressure. Contents: 1 pump cover o-ring, 1 pump bushing, 1 c-3 front viton deep lip seal with flange, 1 pump gasket. Total 4 pieces. Assembled weight 1 lb. Before ordering, confirm the transmission code stamped on the unit matches 5R55W, 5R55S or 5R55N and that the build year falls within the [02-ON] range for your application. What's in the box 1 x Pump, 5R55N W S Cover O-ring 1 x Gasket, 5R55N W S Pump 1 x Seal, A4LD 4R44E 4R55E c-3 Front [W Flange] [Viton Deep Lip] Black .aftermarket Metal Clad 1 x Bushing, 5R55N Pump W S Compatible vehiclesFits Mustang [05-10], Thunderbird [02-05], Explorer [02-10], Explorer Sport Trac [05-10], S-Type [00-02], XK8 [01-02], XKR [00-02], Aviator [03-05], LS [00-06], Mountaineer [99-01].