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12 Valve 2nd Gen Dodge Cummins 94-98 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with P7100 Injection Pumps

GEAR RATIO'S

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Old 02-18-2012, 12:50 AM
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Default GEAR RATIO'S
What is a good gear ratio for worked cummins with 35" or 38" tires???? I'm running 3.54 with 35" tires....1575 RPM @ 65 MPH in overdrive... I plow snow... but in summer want to cruze

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Im thinking 4.56- 4.88
 
Last edited by MECHANIC; 02-18-2012 at 12:50 AM. Reason: Automerged Doublepost
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Old 02-18-2012, 01:17 AM
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Right now in my 3500 dually with 285/75's and I'm running 4.11's. I'll be struggling going 70 at 2400 RPM's. I'm sure tires have a big difference but I would think 4.57 or 4.88 would be too low of a ratio.
 
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Old 02-18-2012, 02:58 AM
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4.10's with 36.5" rubber and a 5 speed OD ratios (didn't know what ya had?) puts you just over 1900rpm at 70mph, 1800 at 65mph.
 
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Old 02-18-2012, 04:13 AM
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yeah, no more than 4.10s,
 
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Old 02-18-2012, 10:13 PM
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OK THANKS................I have an auto w/OD..so it will lower my RPM's.
 
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