You are right about that washer, it's actually a "gasket" to prevent fluid leakage out of the 4 speed.(90 wgt gear oil actually) It's made of copper and it is almost "paper thin", the original GM part # of the gasket was: 3929530. You have to use the gasket as it positions the switch in the right place relative to the trans shift fork lever attachment.
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Peter Serio
Owner, Precision Pontiac
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Peter Serio
Owner, Precision Pontiac
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