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1st Generation Dodge Cummins 89-93 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with Rotary Injection Pumps

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Old 12-09-2009, 12:29 PM
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Default Gears
I am looking to change out my gears on my truck so that i can keep my RPM's down and get better gas mileage...? does anyone know what gears would be best for my truck?
 
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Old 12-09-2009, 12:32 PM
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what gears are in your truck right now
 
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Old 12-09-2009, 01:02 PM
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tell ya the truth, i could not tell ya. whatever came stock in the '90 dodges. its a 1 ton
 
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Old 12-09-2009, 01:15 PM
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Probably got a 4.10 gear set. I'd go with a 3.73 gear set.
 
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Old 12-09-2009, 10:42 PM
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if you want to get 'em way down, the trucks with 3spd automatic's (89-90) had 3.07's in them
 
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Old 12-09-2009, 10:58 PM
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3.07 and 3.55 in autos and 3.55 and 4.10s in standard were the normal in 91s
 
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Old 12-09-2009, 11:47 PM
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is it a 5 speed or auto
 
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Old 12-10-2009, 01:26 PM
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It is a 3 speed automatic..... It runs through the gears fairly quickly, and hits 3rd gear before 50mph i believe, so with the RPM's that high, cant possibly be to good for gas mileage.....
 
Last edited by dodgeflatbed; 12-10-2009 at 02:57 PM. Reason: adding on to
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Old 12-10-2009, 03:12 PM
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there is a guy up the street from me who runs a diesel shop and he put the 3.07 rearend in his rig (3speed auto made in 1990) and hes very happy with it
 
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Old 12-11-2009, 10:59 AM
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thank ya'll. does anyone know of a website online of where i can check these gears out..?
 
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