<P> Ram, once again, put the Center axle disconnect in 3500 4x4 models . 2500 Ram trucks did not have a CAD system until 2014 models . Ram claims this technology to improve fuel efficiency by 1 MPG, although EPA tests do not include class 2 and class 3 trucks in the MPG / fuel efficiency tests . The 4x4 saw additional changes with the transfer case now being made by BorgWarner instead of New Venture Gear . </P> <P> A new model offered for the 2013 Ram is the HFE (High Fuel Efficiency). Based on the SLT model, the HFE offers 18 / 25 MPG out of its Pentastar V6 engine and eight - speed Torque - Flite transmission, which has nothing in common with the original Chrysler built TorqueFlite . It is available only in the six - foot bed, two - door, regular cab model with two - wheel - drive only . Standard features include a 220 amp alternator and an 800 amp battery to assist with the Start - stop system . 3.21: 1 axle gearing is also standard . </P> <P> The option of air suspension became available on the rear of 2014 model year 2500 and 3500 pick up trucks . 1500 models added the option of a Eco-Diesel V6. 2500 models now feature coil spring suspension, instead of leaf spring . The cast iron, flex fuel, 4.7 V8 Chrysler PowerTech engine was discontinued, ending Corsair engine production, leaving the Ram 1500 with two engine choices . The aluminum, flex fuel 3.6 V6 Pentastar is now the base engine, along with the 8 - speed Torque - Flite transmission . The 3.6 L Pentastar V6 was available on Laramie and Longhorn trims . The Ram heavy - duty series of trucks (2500, 3500, 4500, and 5500) received a new interior design and revised exterior styling from the Ram 1500, which was restyled in 2013 . </P> <P> For 2016, the all - new Ram 1500 Rebel debuted, offering off - road suspension with a 1.0 inch (2.5 cm) higher ride height, larger tires, and a unique interior to add to the Ram 1500 Big Horn and Lone Star trim levels . It features a unique blacked - out grille with powder coated front bumper and exclusive aluminum hood, skid plates, and tow hooks . It is available with either a 310 hp (231 kW) 269 lb ⋅ ft (365 N ⋅ m) 3.6 L Pentastar VVT FlexFuel - Capable V6 engine or a 395 hp (295 kW) 410 lb ⋅ ft (556 N ⋅ m) 5.7 L HEMI V8 engine . Four - wheel drive is available with either powertrain, but the two - wheel drive model is V8 - only . The sole body configuration offered is a crew cab with a short pickup bed . </P>

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