Vehicle speed sensors send electrical pulses to the computer, pulses which are generated through a magnet that spins a sensor coil. When the vehicle's speed increases, the frequency of the pulse also increases. Symptoms of failure include hesitation, surging, improper shifting, loss of cruise control, loss of speedometer. Recommended service is to check connections for proper output signal. Walker Products Vehicle Speed Sensors (VSS) are designed and manufactured to meet or exceed OE Spec, fit, form and function. Walker Products began supplying the fuel system and engine management needs of the automotive industry since 1946. Today, As an ISO 9001: 2015/TS16949 certified company, we continue our commitment to supplying the highest quality products. Fit: Ford E-250 2004-2003, Ford E-250 Econoline 2002-2000, Ford E-350 Club Wagon 2004-2003, Ford E-350 Econoline Club Wagon 2002-1999, Ford E-350 Super Duty 2004-1999, Ford E-450 Econoline Super Duty 2002-1999, Ford E-450 Super Duty 2004-2003, Ford E-550 Econoline Super Duty 2002, Ford Econoline Super Duty 1999, Ford Excursion 2005-2000, Ford Expedition 2002-1997, Ford F-150 2003-1998, Ford F-150 Heritage 2004, Ford F-250 1999-1998, Ford F-250 Super Duty 2004-1999, Ford F-350 Super Duty 2004-1999, Ford F-450 Super Duty 2004-1999, Ford F-550 Super Duty 2004-1999, Lincoln Blackwood 2002, Lincoln Navigator 2004-1998