Another 2011 CTD 3500 question

Cummins12V98 wrote:

Ron3rd wrote:
As mentioned in another thread, my daughter picked up a nice pre-owned 2011 Ram 3500 CTD dually. How do we determine which rear end ratio it has?

Have her hit the road, what is her RPM's in 6th @ 60? If it's 1,300 it's 3.42's, if it's 1,750 it's 4.10's and somewhere in-between it's 3.73's.