This internal wire harness connector seal is a great replacement for 2001 - 2019 GMC/Chevrolet HD models with 6.6L Duramax engines and Allison LCT/GM 4T65 - E transmissions. It helps prevent oil leaks from the harness connector. It has a 20 - way pin, is a direct replacement, and comes with an o - ring for the connector body. It fits Allison LCT1000 (MY2001 - 2019), Allison LCT2000, and GM 4T65 - E. Also, it matches OE internal harness P/N's: 29545307, 29541371, 29539792, 29543336. Part Number: FPE - HAR - GM - LCT - SEAL.

Using this wire harness connector seal is easy. First, make sure your vehicle is turned off and cool. Then, locate the old seal at the harness connector. Carefully remove the old seal and clean the area around the connector. Next, take your new seal and place it in the connector, making sure it fits snugly. The o - ring should be properly seated. When you're done, you can start your vehicle and check for any oil leaks. As for maintenance, it's a good idea to inspect the seal periodically, say every few months. Look for signs of wear, like cracks or damage. If you notice any issues, replace the seal right away. Also, keep the area around the connector clean to prevent dirt and debris from affecting the seal's performance.