How To:Biggest Magnum TQ Monster
The 46 already has the bigger OD clutch pack, from the word on the street, all of the old school upgrades are already a part of the newer transmissions. Like that billet overrunning clutch in the back of the case, from factory. As far as I know, slap the TFOD-JR in it and roll it untill you need to go through it, the 46RE run behind cummins all day.
It's 95+ so it's a RE, you can verify because of the plug on the drivers side
As far as the difference 42 vs 46, The ID numbers are stamped on the case's left side just above the oil pan, run them into google and see what comes up. If I was to bet, it's in a ram with a 5.9, so it's going to be the 46. 42's are in Dakotas.