I have an 04 Cummins. Trans is stock but I’ve done a bunch to truck and know it good. I’m just not good with trans. If I put my truck in R on a level ground it will go in reverse but any gain up is a no. After driving around for a month or two I new it had to be my rev servo. It’s almost like it’s not getting enough fluid but my first gear is money and is plenty strong. I bought a reverse servo nut havnt put in yet because I wanted to save money for Upgraded parts. Then comes the bs. Keep in mind I have a TC lock up switch. 33ohm resister. Still won’t lock my converter. My question is what should I buy or what do I need to get my transmission to go in reverse which I think is the reverse servo? And what do I need to do to get my overdrive and lock up back need help ASAP and I’ll take care of this truck I clean all the sensors. And these are the only two problems or three . Help I heard get a Governor pressure Solenoid. Transducer , Y’all help. I know so many things about engines on these Cummins but the 48re I’ve never played with.