I’m new to Cummins and the guy I got it from said the transmission was new. I Went to the gas station and fuelled up and when I tried to put in drive the shifter was loose. Got it towed and got mechanic to change the shifter cable and the shifter linkage. he said he adjusted cable and everything but now wherever you put the shifter it goes into reverse. Just seeing if anyone knows what it could be before i spend a bunch money sending it to the shop. Thanks for reading