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

Gear ratio

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Old 04-06-2010, 01:13 AM
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Default Gear ratio

I was wondering if some of you 5-speed guys could tell me what rpm you are running at 70 mph and what gear you have? The hood tag says 3.55 on mine but I think it may not be right. I'm doin 2200 or so-ish at 70
 
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Old 04-06-2010, 01:19 AM
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4:10 in mine same 2200ish at 70
 
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Old 04-06-2010, 02:08 AM
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count it out it should take 4.10 spins of the drive line to make one turn of the wheel for a 4.10 gear and so on
 
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Old 04-06-2010, 06:20 AM
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it sounds like you got 4.10, my truck dont even do 2k at 70 with the tranny slipping, except when im pulling or going up hill
 
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Old 04-06-2010, 07:21 AM
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Originally Posted by wes-cummins
it sounds like you got 4.10, my truck dont even do 2k at 70 with the tranny slipping, except when im pulling or going up hill
Well that pretty much confirmed my theory. I'm not complaining but it's a used truck that was swapped to 4:10… odd. Thanks guys. Good luck clutch shopping Wes
 
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Old 04-06-2010, 09:18 AM
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yea i got a 6speed rdy to put in, some day when i get the time, im sure its guna be a job 5600s are heeeavy
 
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Old 04-06-2010, 10:21 AM
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That will be a cool swap
 
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Old 04-06-2010, 11:31 AM
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i am doing 80 in 2,000 rpm so i dont know
 
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Old 04-07-2010, 01:16 AM
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Yeah it sounds like the guy before me put 4:10 gears in because all tags on the truck say 3.55 . Odd just odd
 
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Old 04-07-2010, 08:36 AM
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i have a 5spd with 3:55 gears and i run 2 grand and 70mph exactly.
 


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