New rebuilt transmission gets lost in 1st gear. I have an 04 Ram 3500 5.9 Cummins and 4 spd automatic and it slips in 1st but shifts fine

[wayburn]

when I get going down the road. Very aggravating when trying to pull out in traffic. Sometimes I can feel it shifting while I am stopped. I had it rebuilt and have had it back 3 times and the last time it fixed this issue for about 4 months. I don't want to go back a 4th time for the same issue. Any ideas anyone??

 

[jws123]

Check fluid level an scan it for codes see if its throwing any trans codes could be any number of things to be honest i would just take it back to the trans shop who did it or find a better one and get their opinion maybe they messed something up.