I have had some strange issues with my transmission lately but they are likely just the same problem I've had for a while getting worse.

Yesterday, I was pulling out of a parking lot and the car acted like it was in neutral all the sudden.

It was in gear but wouldn't move.

I put it in neutral and the lower gears a few times and it started to move.

This is basically what's been happening for a few months now but never to the degree that the car wouldn't move. Until yesterday it just seemed like the transmission was slipping in first when I gave it medium to high amounts of accelerator and it shifts way too early from first to second.

My question is whether this is a "rebuildable offense" or is there something less tragic at work?

What's all this talk about a B2 piston? Does it apply to this car?

The refusal to move yesterday only happened once and it was very brief but I suspect it is what I can expect to happen much more often if I don't get it fixed.

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1993 W124 300D
-297K on the clock as I type this.