Im in the market for a new rig but I'm stuck between 4 generations of Truck... I've always been a Chevy guy but when it comes to Diesels I think Dodge is on top only because... CUMMINS! I love the Chevy body style but im not 100% set on the Dmax. I need some advice from owners of the following!

2007.5 - 2010 GMC SIERRA, CHEVROLET SILVERADO
Midway through the 2007 model year, GM launched the LMM Duramax. The goal of this engine was to meet strict emissions regulations, while offering up a small performance increase as collateral. The LMM produced 365 hp and 660 lb-ft. Fuel economy suffered severely, caused by the adoption of a diesel particulate filter and active regeneration. To be fair, both Dodge and Ford trucks experienced similar complaints regarding poor fuel economy for the same reasons. Beyond that, the trucks are reliable and the DPFs are not typically prone to clogging issues.


2011 - CURRENT GMC SIERRA, CHEVROLET SILVERADO
The Duramax became more complicated for 2011 to meet even stricter emissions. There seem to be no major reliability concerns. The trucks employ SCR (selective catalytic reduction) technology with the use of DEF (urea injection) in order to combat NOx emissions. A 5 gallon DEF tank is required to remain filled, though the use of exhaust after-treatments actually helped the 2011+ model trucks achieve an 11% + increase in fuel economy versus the 2007.5 - 2010 models. These trucks transmit 397 hp and 765 lb-ft of torque through a stronger-than-ever Allison 1000 6 speed automatic (a manual transmission option was retired).
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2003 - 2007 1/2 DODGE RAM (24V CUMMINS)
The 2003 model year kicked off the 3rd generation Dodge Ram. The body underwent significant changes, most notable of which was the introduction of a large grille and smooth body lines. The VP44 mechanical injection pump was replaced by a high pressure common rail system, making these model years extremely popular. A 555 lb-ft high output version of the Cummins was available for 2003, which became the standard torque rating for 2004. The 2004 H.O. version offered 600 lb-ft, compared to the standard 555 lb-ft and the California model's 460 lb-ft (the H.O. was not available to CA residents for emissions reasons). The H.O. was discontinued when output for the 24v reached its peak for 2005 through 2007 model years at 325 hp and 610 lb-ft. For this reason, the 05 to 07 are prized pickups and hold their value relatively well. The NV4500 was the standard manual transmission until 2005, while the 48RE was the standard automatic transmission from 03 to 07. The NV5600 was used on high output models, which were not available with an automatic. For 2006 and 2007, a Getrag G56 6 speed manual replaced the NV4500. The 48RE, though stronger than the 47RE used previously, is considered the lesser transmission. If you plan on performing any modifications to your engine, plan on beefing up the auto. It's generally reliable at stock power levels, though its longevity is questionable.


2007 1/2 - 2015 RAM (6.7L CUMMINS)
Cummins launched the 6.7L mid year in 2007. The introductory ratings were 350 horsepower and 650 lb-ft with an automatic transmission and a derated 610 lb-ft when coupled with the manual transmission. 2007 was the first time that a manual transmission equipped truck was derated, as historically the automatic equipped Rams were derated. "Dodge Ram" became "Ram Trucks", or just "Ram" in 2010. The 6.7L Cummins uses a diesel particulate filter system, which significantly reduces fuel economy and reliability. Early engines often suffered from DPF clogging. The DPF can be removed via aftermarket equipment, but this technically eliminates the trucks street legality. The 68RFE 6 speed automatic was standard for these model years, which is leaps ahead of the 48RE in reliability, performance, and longevity. The G56 manual was available, but are rare due to the derated output. In February 2011, the Cummins torque output was increased to 800 lb-ft, while horsepower remained the same. This output was only made available for automatic equipped trucks. The body style was also altered for 2007, as sharper lines and a more refined shape were introduced. In 2013, three variants of the Cummins were introduced. When equipped with the G56 manual, engines are rated at 350 hp and 660 lb-ft. Backed by the 68RFE automatic transmission, output was bumped to 370 hp and 800 lb-ft. A high output 385 hp, 850 lb-ft version was also introduced, mated to a medium duty Aisin 6 speed automatic transmission. For 2015, the H.O. engine saw torque increased from 850 to 865 lb-ft. This model remains only available in 3500 model pickups.