dodge 1500 Cummins swap Rear axle gearing for towing?
07-17-2018, 02:50 PM
#1
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Thread Starter
dodge 1500 Cummins swap Rear axle gearing for towing?
Swapped out a hemi for a cummins in my 04' 1500. What gearing ratio would be the best for hauling my 18' toy hauler that will allow me to do 70 mph at 1500 rpm on the freeway. As it sits, I can only get to about 55 mph and she's working way to hard. It has also been changed to a manual transmission.
07-17-2018, 04:24 PM
#2
Registered User
1500 is not a good RPM range for pulling a trailer.
You want to be 1800-2000 RPMs for the best mileage and still have smooth power.
The Cummins motor has "power pulses" that rip apart drive line parts if lugged at a low RPM and worked hard at the same time.
3.54 would be a good gearing option for a tow rig that see lots of highway time.
You want to be 1800-2000 RPMs for the best mileage and still have smooth power.
The Cummins motor has "power pulses" that rip apart drive line parts if lugged at a low RPM and worked hard at the same time.
3.54 would be a good gearing option for a tow rig that see lots of highway time.
07-17-2018, 04:40 PM
#3
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Thread Starter
1500 is not a good RPM range for pulling a trailer.
You want to be 1800-2000 RPMs for the best mileage and still have smooth power.
The Cummins motor has "power pulses" that rip apart drive line parts if lugged at a low RPM and worked hard at the same time.
3.54 would be a good gearing option for a tow rig that see lots of highway time.
You want to be 1800-2000 RPMs for the best mileage and still have smooth power.
The Cummins motor has "power pulses" that rip apart drive line parts if lugged at a low RPM and worked hard at the same time.
3.54 would be a good gearing option for a tow rig that see lots of highway time.
07-17-2018, 09:31 PM
#4
Registered User
1500 is not a good RPM range for pulling a trailer.
You want to be 1800-2000 RPMs for the best mileage and still have smooth power.
The Cummins motor has "power pulses" that rip apart drive line parts if lugged at a low RPM and worked hard at the same time.
3.54 would be a good gearing option for a tow rig that see lots of highway time.
You want to be 1800-2000 RPMs for the best mileage and still have smooth power.
The Cummins motor has "power pulses" that rip apart drive line parts if lugged at a low RPM and worked hard at the same time.
3.54 would be a good gearing option for a tow rig that see lots of highway time.
While I agree with the low RPM harmonics, peak efficiency tends to coincide with peak torque - In other words, that 1500 ish RPM is the best for mileage.
07-18-2018, 07:00 AM
#5
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On a side note...
That adam sandler thing is way beyond irritating....
I have a difficult time reading with that back and forth thing going on. Makes me seasick.
lol
That adam sandler thing is way beyond irritating....
I have a difficult time reading with that back and forth thing going on. Makes me seasick.
lol
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nonrev (07-19-2018)
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07-21-2018, 05:19 PM
#8
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What size tires are you running? I assume you are running a 5spd when you stated that you swapped in a manual trans. I'm gonna guess a tiny tire and a factory 3.92 gearing. If you are still running the stock half ton axle and plan to tow with that truck you are sitting on a ticking time bomb. That hemi probably made as much torque as the Cummins but, as Oliver said, its the power pulses that will destroy a drive line. That's why Dodge used the Dana 70 for the 1st gens and a Dana 80 for the later trucks, and the new stuff is almost medium duty parts. We need some more info.
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