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5.9L CR Performance Discussion of 5.9 Liter Dodge Cummins Diesels with Common Rail Injection Related To Performance And Longevity

3.08 or 2.73 gears?

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Old Mar 6, 2012 | 10:49 AM
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hawk's Avatar
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Default 3.08 or 2.73 gears?
I need advice. Im going to change my gear ratio in my dif but Im up in the air between 3.08 or 2.73 gears. Can any one give me some advice on which would be a better choice?
 
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Old Mar 6, 2012 | 11:17 AM
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What are your plans for the truck?
 
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Old Mar 6, 2012 | 11:28 AM
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Need information. Things like:

1. Tire size.
2. Speeds you drive the truck.
3. What do you use the truck for?

If you are just looking to lower cruising speed?
 
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Old Mar 6, 2012 | 12:36 PM
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those are some pretty tall gears
 
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Old Mar 6, 2012 | 12:57 PM
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I dont haul much. I am ooking for fuel milage. Im rinning stock tire size. 265 70 17
 
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Old Mar 6, 2012 | 02:54 PM
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Find a calculator and do the math and see what RPM's that would throw you at 65mph. You'll need to know tire size (inches) and tranny overdrive ratio.
 
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Old Mar 6, 2012 | 09:09 PM
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2.73 will be somewhere between 1000 and 1500 drop. Im not sure what 308 will do. And how do I find out my over drive raito?
 
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Old Mar 6, 2012 | 09:56 PM
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cool cruising 70 mph at 1000 rpm
 
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Old Mar 6, 2012 | 10:14 PM
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Originally Posted by hawk
2.73 will be somewhere between 1000 and 1500 drop. Im not sure what 308 will do. And how do I find out my over drive raito?
Google is your friend, my man. What transmission do you have?
 
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Old Mar 6, 2012 | 10:46 PM
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Unless you are on the highway 95% of the time going to even a 3.08 may hurt your mileage. In around tow/city and stop and go traffic you will be using more throttle to get her moving, hence worse mileage.
 
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