Having some transmission problems. At first it seems would start driving off and shift into second but not into third, I held rpm up to about 2100 for a few seconds and it finally jumped into third and drove home ok. transmission fluid level ok. Later I disconnected batteries to hopefully reset the computer etc. . It drove good shifting good again, drive a couple hrs on interstate no problem. Hooked up a motorcycle trailer and began towing and had to pull up a fairly steep hill, and it went about half way up the hill and wouldnt pull anymore, held rpm about 2100 and it was just stalled on the hill. Managed to turn around and park the thing.
2001 Dodge Ram with the Cummins eng 4wd, automatic. Trying to figure which transmission it has. Looked at stampings on side of transmission and it's hard to read. Best I can figure it's FK5211S851AB for the part number. Can someone cross this to the transmission model? I am wanting to get good parts and fix this transmission right, so I dont have anymore trouble with it. I dont pull real heavy loads, mostly just driving the truck with no towing. Any info is appreciated.

2001 Dodge Ram with the Cummins eng 4wd, automatic. Trying to figure which transmission it has. Looked at stampings on side of transmission and it's hard to read. Best I can figure it's FK5211S851AB for the part number. Can someone cross this to the transmission model? I am wanting to get good parts and fix this transmission right, so I dont have anymore trouble with it. I dont pull real heavy loads, mostly just driving the truck with no towing. Any info is appreciated.
