I read that 2006 WAS the first year for Rams
to have the MDS system, other dodge vehicles had the system sooner
the site that i trust for information reads
The 2005 model year brought a switch from the NV3500 five-speed manual transmission to the Getrag 238 six-speed gearbox (3.7/4.7 engines), and a low lockup speed and turbine damper added to the 545RFE with 4.8 V8. The 3.7 engine was treated to numerous economy and idle-quality changes, with a new cam profile, lash adjusters, rings, and a 9.7:1 compression ratio; and the 4.7 got EGR and knock sensors.
2006 saw the first application of the MDS system to the Hemi on trucks, increasing gas mileage around 20% by switching to four cylinders when eight were not needed;
using variable line pressure on the four-speed automatic helped mileage and longevity. A front axle disconnect on 4x4 increased gas mileage. The frame was re-engineered and hydroformed for greater rigidity and strength. Numerous cosmetic and feature changes were made at this time.
Read more at http://www.allpar.com/model/ram/ram-...ktrack=kcplink