4L60E durability question
I believe you are talking about the reverse drum. It attatches to the "sun gear". It strips or breaks and 2nd, 4th, and reverse will not work. The replacement is called "The Beast". It is an option when repairing the trans. They have been out for a long time. A stock piece can still be used if the vehicle is not going to be "played with". Hope this helps.


