I just got a call from my uncle because he bought a repo pickup out of Mass. sight-unseen. It is a 2006 Ram 2500 QC LB Cummins Auto--on the writeup, under rear axle, they show "11.50." Can anyone interpret what this number is because he called me trying to figure out what gear ratio it is, 3.90/4.10 etc.

Thanks guys!

 

ring gear size 11.5 inches

 

It specifies that the rear differential is an 11.5" which is made by AAM, btw. Just that information will not tell you what gears are in it however. Available factory gears are 3.73 standard or the 4.10 options in a CTD 2500...

 

there might be another tag on there telling the ratio