My '98 Ram diesel had a three speed tranny with OD lockup. The gear ratios were so wide that the numerical axle ratio had to be high. However, my '13 Ram diesel has a computer-controlled six speed which means that engine rpms can be kept in the zone of maximum torque (800 ft/lb). Shifting from gear to gear is done only as needed, so the axle ratio becomes less important. Don't get me wrong, I loved my '98! It was a roaring beast and I hated to see it go. But the newer truck is so much stronger, easier to drive, and very comfortable.
"But, oh that magic feeling, nowhere to go." -- The Beatles
2015 Flagstaff 8528RKWS fiver
2013 Ram 2500 CTD Laramie CC SB 4WD Auto