Hello, my ram starts in the 3 gear and stays there.
It doesn't shift in od and it doesn't shift down.
I've changed both sensors in the transmission and the speed sensor on the rear differential.
Also I've checked the tps and all the wiring on the transmission.
The check engine light says it's the od solenoid but I replaced it.

I need help thanks a lot

 

Getting any other transmission codes? What happens if you pull it all the way to L, and drive away? Does it start off in first then?

Welcome to DF!

 

If I put it manually in 1 it starts in 3 if I put it in 2 it starts in 2.

And there are no other codes
Thanks man

 

Disconnect the 8 pin connector altogether. Go for a drive. You will have ZERO automatic function, so, start in first, and shift when appropriate. If it goes into the gear you tell it to, when you tell it to, then its an electronic problem, if it doesn't, its teardown time.

 

I disconnected the 8 pin and drove.
And nothing happens. It drives like before
1 gear won't go in I started in 2 gear manually switched to D and then it shifts in the 3 gear

 

Not a good sign. Did you find anything unusual in the pan when you dropped it to change the electronics?

 

Unfortunately not. Everything looks good.
Does the transmission need pressure to shift?

 

Yes, everything in there is hydraulically controlled. PCM controls governor pressure... everything else is mechanical. You could try pressure testing it, but, that is beyond my knowledge level. There are others that have a clue though.

How many miles on it?

 

Yes Maybe it's a pressure problem. One week ago I didn't know anything about transmissions .
It has about 190000 miles on it

 

Ouch. May be approaching end of life there.