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I'm going to try to provide the info you need to help me.
I do have overdrive, it finally shifts into about 65mph.
Here is a pick of the wires coming out of the trans, they are located right by the shifting lever.
As for a little switch on the column, I really dont see anything except a hazard switch.
My truck shifts from park to reverse, neutral then drive. No low gear.
I'm sorry, I dont know what a converter lock up is. I'll look that up in a minute.
I'm thinking this steering column is out of something different than our trucks.
Guide me as to where I should point my camera!!