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John, I'm not sure I got clear answers.
Your car is a manual transmission?
"...when cold it seems as though the oil is too viscous..."
Do you mean that you've measured the viscosity? Or do you mean that when cold, it shifts hard?
"...the OD and the light work fine...won't let me turn it on until the trans is hot..."
Please explain this more. Do you mean that you push the button and nothing happens (with either the OD or the light), or do you mean that the indicator light comes on but the OD doesn't engage?
If the light remains off in the cold (when you push the button), then I'd say the relay is balky. But you could also have a bad push button or wire from button to relay. Howeverm I've never heard of temperature-sensitive push buttons (whereas I have seen relays respond to temp).
Whatever, resolder the relay.
Don Foster (near Cape Cod, MA)
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