2nd accumulator piston help!
If you decide to order one:
http://www.transmissionpartsusa.com/...-000035957.htm
Some models/years of the 4L60 (or perhaps 700R4) did use the larger shaft diameter for the 2nd accumulator piston, but most use the smaller shaft diameter.
Alternatively, you can get the Sonnax pinless accumulator piston which will work as either a 2nd or 4th:
http://www.transmissionpartsusa.com/...-07799803k.htm
I've heard of the springs breaking too, so you might want to replace the spring(s).






