66RFE Input/Output Speed Sensor:
The 66RFE Input and Output Speed Sensor have a service life of about 100,000-150,000 miles (or 10 years) in most transmissions. After this, they are usually living on grace. It is good practice to replace them during any rebuild, or at appropriate mileage.
Despite cheap aftermarket alternatives with lower quality copper windings, connections and otherwise, the OEM speed sensors are consistently the highest quality sensors on the market for the Chrysler community. Fortunately, Next Gen Drivetrain™ keeps these popular items in stock!
Whenever performing this repair or maintenance, it is highly advised to change the 66RFE Transducer as well, as they generally have the exact same lifespan.