trans trouble

[StvsJp]

I have a 99 Ram Cummins with an auto trans. The trans doesnt want to upshift out of 1st gear. Any ideas?
Thanks

[fox]

Most likely it is the gov. pressure transducer. It is mounted on the valve body.
Get a gauge and put it on the trans gov. port. The pressure should go up about 1 psi for each mph.

There are other things such as stuck valve.

[fox]

I forgot something,,

Most dealer techs will change both, the solenoid --4617210 and the transducer --56028196 since the pan is off.
You will spend about $150.