Hi,

I had the same symptoms, started car while doing errands, put it and gear and sudden nothing- no forward, no reverse.
I suppose you could test by having a helper step on the brake while you crack a trans cooler line on the radiator- a pressurized leak would indicate the front pump is working.
No pressure- no go. The drive tangs could be broken on the torque converter, or the splines in the front planetary gear set could be stripped.
When mine failed, there wasn't so much as a "click" to tell me anything could be wrong. It was almost as if the transmission had been stolen while I was in the store.
No other symptoms of impending failure preceded this.



snapped_bolt

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'81 240D For now, a good place to borrow new parts
'80 300TD Probably will be put back into service!
'79 240D BACK IN SERVICE SINCE 09/16; limited use, oil leak. Guide pin r/sealed/replaced. Still a leak. Front crank seal....