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HELP: 1957 GMC Hydramatic problems

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I have just got my 57 GMC model 100 1/2 ton pickup with 347 V8 Pontiac in running condition after sitting for almost 20 years. If I remember right, everything worked when we parked it in the shed.

The problem is that the automatic transmission Hydramatic works intermittenly and acts like it is slipping or sometimes works pretty well. Forward gears seem to shift ok although, I have not driven it very far. The fluid level is ok, looks and smells ok. Is this because of not being run and will get better with use or is it hurting it to drive it?

Thank you for your help!


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