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In 1998 Dodge had the 47RE 4-speed transmission behind the Cummins motor. This transmission was adequate under design conditions, however, like any other component that is exposed to exceeding design parameters they proved to be less reliable. Chrysler later replaced the 47RE with the 4-speed 48RE, a much more substantial design with heavier componentry and a far better computer program for diesel operation. These have proven to be fairly reliable.
The new 6-speed 68RFE that is unique to the LD Dodge Cummins' is built off of the 545RFE used behind Dodge truck V8s after 2002. The 545RFE is without a doubt one of the most reliable and durable transmissions available in light duty trucks, bar none. These transmissions are bandless, fully electronic, fully adaptive and have been exceptionally trouble free. After model year 2007, I think you'll find more complaints with the Allison than you will a 68RFE.
Dodge diesel mediums (4500 & 5500) use a 68RC, which is a different transmission.
Dusty
tows like a bear, decent fuel mileage, worst reliabilty and not quality biult.
f250, 5.4 gas, auto, no power, poor fuel economy, uncomfortable, can't tow a whole lot with out trouble--but it is a gas job
ram 3500 mega with cummins, great trucks tows great(duramax a little better but I believe it is the tranny that makes the differance)best fuel mileage, not a very nice ride, well biult, feels a lot more solid than the other 2.
you can read all the stats you want but they do not mean anything, test drive them and find the one you like from the day to day people that drive the trucks to the max capacity, I am a general contractor and work my trucks so I do have a small amount of knowledge when it comes to them.