Quote:
Originally Posted by kowbra
Interesting; maybe due to the 10 speed transmission change?
RAM cummins went the other way; in 2019+ they switched to a 3.73 rear axle ratio where years prior were 3.42.
The 3.73 with the 6 speed transmissions make a lot more sense for the RAM cummins. The peak torque (usually the most efficient rpm for a diesel) is at 1800rpm. With the 3.42s, 1800rpm puts you at about 65mph, whereas the prior generation was at 72mph.
So, especially when towing heavy, 6th gear at 65mph puts you right in the peak power band; exactly as it should be.
BTW, if you want to check out a cool tool to calculate this, see here
Now, if RAM puts the rumored ZF 8 speed in the cummins models? That could likely shake things up again.
Brad |
Peak tq on an ISB 6.7 is 1700 rpm and peak HP 2800 rpm
With 4:10s at 65 I turn 1730 rpms on my Dually.
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2018 Ram 3500 MegaCab 4x4 Aisin, 4:10 Gears
Titan 50 Gal Tank, Air Lift Wireless Bags
2017 3160 RL