Recommended tool kit 34716-TL is no longer in production. Check with your distributor for availability.
Package Quantity: 2
GM 4L80-E and 4L85-E forward drums are often replaced due to wear of the sealing ring bore caused by contact with the input shaft. Contact between shaft and drum occurs because of looseness/wear of the support bushings and tight clearance between shaft and drum bore. Worn drums can be salvaged by machining away the worn area, increasing the bore I.D. to .900" and installing the Sonnax oversized outer diameter forward drum sealing rings 34716-01. The oversized seal diameter restores proper sealing with the larger bore, while the increased clearance reduces future wear by making clearance consistent with other applications.
Tool kit [34716-TL] is not required but is highly recommended to prevent damage to the new oversized sealing rings when inserting the input shaft into the machined forwared drum I.D. bore.