This should settle the "coil spring" question
I stumbled across a thread on one of the Cummins forums where several members posted pictures of their coil sprung Ram 2500s loaded with various weights. HERE IT IS
Forum Discussion
jus2shy wrote:APT wrote:
The problem with the half tons is the spring rate, not the type of spring. Ram just proves that with the 2500 gasser IRS with clearly higher rates and capacity.
an IRS on HD trucks would be a dream, but those setups would also be very pricey to build and maintain (lots of moving parts, bushings, etc). Look at all the Military trucks, lots of IRS and IFS made systems there with far higher payloads than our Civvy vehicles. I believe almost all of them are coil sprung, as well as the light rail vehicles in Portland and Seattle (those each weigh 15 tons).
Maybe the Ram should have on irs on the rear... I count 12 twelve pivot points on the new coil setup.
