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3rd Gen Engine and Drivetrain -> 2003-2007 5.9 liter Engine and drivetrain discussion only. PLEASE, NO HIGH PERFORMANCE DISCUSSION!

4.10 or 3.73

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Old Mar 4, 2009 | 05:31 PM
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4.10 or 3.73
I was wondering where on the truck you find out what gears you have. Does anyone know where can can find this info.
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Old Mar 4, 2009 | 06:19 PM
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i beleave it is in the glovebox
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Old Mar 4, 2009 | 07:22 PM
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Go by a dealership with the VIN# and have the parts department pull a build sheet on your truck. That is what i did way back when.
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Old Mar 4, 2009 | 08:39 PM
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There should be a white production label stuck to the underside of the hood that has the trucks options on it, or on the inside of the glovebox like mentioned.
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Old Mar 4, 2009 | 11:00 PM
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well i didnt find anything in the glove box nor under the hood
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Old Mar 4, 2009 | 11:07 PM
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Read your signature
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Old Mar 4, 2009 | 11:12 PM
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well i dont know if it is for a fact, thats why i am asking
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Old Mar 4, 2009 | 11:20 PM
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i'd try the dealer then with your vin# or if you bought the truck new look at the window sticker
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Old Mar 4, 2009 | 11:26 PM
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Is your truck a manual? If so, the G-56 only came in 3.73s.
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Old Mar 4, 2009 | 11:32 PM
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nope didnt see it in the manual
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Old Mar 4, 2009 | 11:33 PM
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oh sorry no its auto
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Old Mar 5, 2009 | 01:09 AM
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Did you look on or around the diff cover?? Or if you want jack your rear up and rotate the driveshaft and count how many times you turn the shaft till the tire does a complete rotation
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Old Mar 5, 2009 | 01:43 AM
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i'll check tomorrow when i am driving to see how fast the engine is running at like 60 mph i think it is just shy of 2k rpms
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Old Mar 5, 2009 | 01:56 AM
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70 MPH is right about 2000 RPM with stock tires if its a 3.73.
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Old Mar 5, 2009 | 06:58 AM
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At 60 w/ 4.10's it's at right about 1800 rpm and at 70 it's at about 2150 rpm. 3.73's will never have you past 2k rpm before 70.
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