My 2007 1500 4X4 transmission shifts pretty soft in the upper gears even with the pressure boost and DS tune. With over 200,000 miles I'm sure it's ready for a rebuild. I found a good deal on a new trans for a '07 2500 and curious if it's the same tranny as the 1500? Mopar has different part numbers for the 2 models. I found a couple reference charts on the net and it lists a 2007 2500 as having a 45RFE instead of a 545..

 

my 07 2500 has a 545rfe. not sure what the difference would be. I'll see if i can find out why the different part numbers.

 

They're all the same for the most part; I believe there was a connector/valve body change in 06 or 07, but physically the same.