4L60 4L60E 4L65E 4L70E Transmission Sonnax Rear Stator Support Bushing The best option to support the 20lb. input housing and improve reliability. Better-Fitting, drop in upgrade PTFE-Coated The original GM 4L60 and 4L60-E/65-E/70-E rear stator bushing comes in narrow and wide versions in both common bronze and harder aluminum type materials. All versions commonly fail or wear out prematurely. Available aftermarket replacements typically have a poor quality fit and are also known to wear. For maximum durability Sonnax offers rear stator support bushing 77002BT-01, a better fitting and extremely wear-resistant, PTFE-lined bushing to stop future wear in its tracks. The Sonnax bushing is the best option for supporting the 20 pound input housing and for improving the reliability of these common units. This bushing is a direct replacement and does not require any machining or modification.