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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3.73, Aisin in 5th at .77 overdrive, equals 1900 rpm at 65 mph.
3.73, Aisin in 6th at .63 overdrive, equals 1555 rpm at 65 mph.
3.42, Aisin in 5th at .77 overdrive, equals 1743 rpm at 65 mph.
3.42, Aisin in 6th at .63 overdrive, equals 1426 rpm at 65 mph.
385 HP at 2800 rpm and 900 ft lb torque at 1600.
I guess if you want to get higher HP the 3.73 looks better. The 3.42 in 6th gear is well under max torque.
My 3.42 works OK locked out of 6th, but the 3.73 looks like it would have higher HP. Something of a trade-off between more HP/torque and lower rpm for fuel mileage.
3.73, Aisin in 6th at .63 overdrive, equals 1555 rpm at 65 mph.
3.42, Aisin in 5th at .77 overdrive, equals 1743 rpm at 65 mph.
3.42, Aisin in 6th at .63 overdrive, equals 1426 rpm at 65 mph.
385 HP at 2800 rpm and 900 ft lb torque at 1600.
I guess if you want to get higher HP the 3.73 looks better. The 3.42 in 6th gear is well under max torque.
My 3.42 works OK locked out of 6th, but the 3.73 looks like it would have higher HP. Something of a trade-off between more HP/torque and lower rpm for fuel mileage.
