Chrysler announced an easy solution for upfitters that need to cut out the back wall of its 2012 Ram 3500, 4500, and 5500 medium-duty (Class 3, 4, and 5) Chassis Cab commercial trucks. The automaker will now provide upfitters with engineering-approved rear panel cutaway instructions because of customer input and requests.

Ram says that 80 percent of the rear panel can be removed using the cutaway instructions without a loss of structural integrity in the cab. The instructions are intended for upfitters who build ambulances, recreational vehicles, box trucks, and other walk-through vehicles based on Ram 3500, 4500 and 5500 Chassis Cab models.

Also new is an optional "Max Tow" upgrade for the 4500 and 5500 Chassis Cab models that gives it a 30,000 pound GCWR rating. The Max Tow package can be had on regular and crew cab models as well as two- and four-wheel-drive models. The Ram Max Tow package adds a new transfer case gear set and chain and sprocket upgrades, recalibrated transmission software, and enhanced cooling radiators.

The Ram 4500 and 5500 Chassis Cab models are powered by a 305-horsepower 6.7-liter Cummins Turbo Diesel engine that cranks out 610 lb-ft of torque. The Cummins is backed by a six-speed manual transmission. An Aisin six-speed automatic transmission and 4.88:1 axle ratio are optional and required for the Max Tow package. The Ram 4500 and 5500 Chassis Cab models can tow up to 22,300 pounds -- an increase of 4000 pounds.

Ram is also adding a new six-speed automatic transmission behind the 383-horsepower 5.7-liter Hemi V-8 in 3500 Chassis Cab models. The new transmission will help increase the Ram 3500 Chassis Cab models' GCWR by 3000 pounds to 20,000 pounds. Ram says the new transmission will also increase fuel economy. If the 5.7-liter Hemi's 400 lb-ft of torque isn't enough, the Cummins Turbo Diesel is also optional on the 3500.

Source: Chrysler