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4RFE did have issues when first released but by the time they changed to the 5RFE (which by the way was developed in conjunction with GM both trannies and the 4L and current 6 Speed all came from the same joint development that GM uses) GM and Dodge had worked out the fluid issues. The 2004 - 2009 Dodges WERE NOT developed by Diamler they were already revealed before the merger. The later 4RFE and the 5RFE are the transmissions you are looking for. By 2003 when GM /Dodge got the mixture right to keep the pumps from leaking and valves from sticking ending the grenading.
Reasons you guys see most dodges and fords smoking is because people over fuel them just like they do the duramaxes. Most people who know trucks know that out of all the engines that the Cummins have the least problems with Duramax following closely, and until the release of the Scorpion 6.7 from Ford they had major issues following the 7.3s demise. Now if you look at the newer diesels I am going to say you should be good to go with all of them. If you look today you will see that the tailpipes of all the diesels are actually clean as a whistle. Only problem you have with Cummins are pre 13 they had a lot of EGR action and clogged the preheaters (no glow plugs) with the Duramax you typically had to drain the intercoolers of oil from the LMM on. If looking for a used diesel I would suggest the LBZ Duramax, 5.9 Cummins, or a 7.3L Powerstroke unless you look to one of the current offerings. The smog diesels upon introduction in mid 2007 all had issues and they were not resolved for a couple of years.
Hope this helps.
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