overdrive

When I first start the car, the orange arrow indicator is on and the whole electrical system feels bogged down (dim lights, low rpm, low fan speed, etc) like it's weak. This is what the car does: Stepping on the gas causes the orange indicator to go off, which also eliminates the bogged down...

...how can I find out more about it.? i am trying to find a replacement for it, don't know like model names or anything. i know chevrolet's have like th350, th400, 700r4, etc.. but what does mine have

I really don't understand when it's suppposed to be used.

1999 Dodge dakota 4x4 Transmission works right, until you drive it about forty minutes then if you let of the gas it will shift out of overdrive regardless of the speed resulting in high RPM then it takes a long time to shift back to overdrive. what could be the problem?

it, is that true? I've been told that I could drive it in 1-3 gears for a long time without a problem. can i go long distances and hills, will it keep going? I put a lot of money into it!