picked up a 83 300sd with the classic B2 piston symptoms. No forward but reverse perfect. Further inspection shows the tranny was rebuilt at one time. When I pulled the B-2 out it was fine and was the updated one. It also has the white plastic bushing installed instead of the aluminum one. I did find a piece of the old orange cover seal in there so i was figuring it jammed the piston and was the problem. I cleaned it all out using a seal pick and replaced the seal with a new one. The problem I am now having is that the orange seal keeps blowing out. I put the new orange seal in the groove and even put a dab of vaseline around it and push the cover in only enough to insert the "C" clip. When I start the car as soon as I put it in drive I hear the hissing sound and when I look a part of the new "O" ring squeezed outside the cover and fluid pushed out. This has now happened 3 times. Any ideas what I am doing wrong? Am I pushing the B-2 piston in too far and when I start it it is slamming against the cover? Any thoughts? thanks Mike

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1983 300TD
1983 300sd