OEM AS66RC Transmission Internal Wiring Harness:
One of the most probable causes of failure to the AS66RC is the transmission internal wiring harness. This problem comes from the copper inside the wires cracking inside the insulator and the cable jacket due to age and use and eventually causing a variety of transmission failures.
Further, the service life of the OEM AS66RC electronics is 120,000 to 150,000 miles (or 10 years), but they often fail sooner due to natural flaws in the original manufacturing quality. Fortunately, the OEM offers an updated replacement that is an absolute part of any rebuild, or high mileage service. This AS66RC Internal Wiring Harness is a true OEM replacement.
Aisin Seiki parts are generally on a large backorder and are difficult to access, but the Aisin experts here at Next Gen Drivetrain™ keep them in stock!