Cancel the noise/frequency that causes gear hunting with this SIMPLE fix! Many of the 98.5-02 Dodge Cummins have a notorious issue in which the transmission cannot lockup in 3rd and 4th gear. The issue is extremely aggravating especially when under load as the transmission hunts back and forth, and can potentially cause the demise of the transmission. ATS has cured this issue with their simple Signal Conditioner that conditions the TPS (Throttle Position Sensor) signal and allows the transmission to have better shift characteristics.