We are learning, as others are, that these parts are becoming a HIGH preventative maintenance item on these old transmissions. A broken or binding B2 piston causes many shifting problems, and as Kent found on his 300E, it destroyed the transmission.

Product Details
The revised B2 can add life to your old transmission. Access is on the right side of the transmission through the big cover plate. In all models except the W126, the transmission should be removed. We believe it should be removed in any case since there will be other seals and o-rings you should replace that may be leaking.
The kit includes:
- Genuine B2 piston upgrade - newest version
- Genuine Nylon sleeve replacement
- Genuine piston seal
- CRP cover o-ring
- Lint-free cloth
- Blue nitrile gloves
The piston will come out easily by hand with no special tools. But the removal of the internal sleeve and seal will require some type of puller. A slide hammer is the quickest and easiest, as you do not need to remove the pan and the valve body.
WARNING: You will not be able to get the old sleeve and seal out without some type of special tool. We offer a quick and easy-to-use slide hammer tool that will not damage the transmission case. See related products below to order separately