4:10 or 3:73 ?
Possible upgrading to Ram dually. I'm pulling 12,500# gvw with SRW and 3.42 rear end. Usually lock 6th gear out. Plan is to move up to new 15,000# gvw 5th. Not sure if I want to get 4.10 or 3:73. Wh...
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Did some work with a spread sheet.
RPMs in each gear. 60 mph is not possible in gear 1 and 2 with all rear gears.
3.42 3.73 4.1
60 mph 60 mph 60 mph gear
8340 9096 9999 1
4448 4851 5333 2
2980 3250 3573 3
2224 2426 2666 4
1712 1868 2053 5
1401 1528 1680 6
It looks to me like the best fit for the 6.7 Cummins with the Aisin 6 speed is the 3.42 gear when towing at 60mph. Even the 3.73 looks better than the 4.1
You just have to run one gear down from the 4.1 with the 3.42. That is the whole purpose of a transmission.
When down one gear the 3.42 can put more horsepower to the road than the 4.1.
Now some will say they need the 4.1 in first gear.
But I am sure even with the 6.7 cummins and Aisin transmission enough torque can be put down to tear the tires off of the wheel rims.
RPMs in each gear. 60 mph is not possible in gear 1 and 2 with all rear gears.
3.42 3.73 4.1
60 mph 60 mph 60 mph gear
8340 9096 9999 1
4448 4851 5333 2
2980 3250 3573 3
2224 2426 2666 4
1712 1868 2053 5
1401 1528 1680 6
It looks to me like the best fit for the 6.7 Cummins with the Aisin 6 speed is the 3.42 gear when towing at 60mph. Even the 3.73 looks better than the 4.1
You just have to run one gear down from the 4.1 with the 3.42. That is the whole purpose of a transmission.
When down one gear the 3.42 can put more horsepower to the road than the 4.1.
Now some will say they need the 4.1 in first gear.
But I am sure even with the 6.7 cummins and Aisin transmission enough torque can be put down to tear the tires off of the wheel rims.
