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Custom Dodge Ram Performance Mods - Engine - 5.7 HEMI V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 5.7-liter HEMI® V8 engine - 390 horsepower, 407 lb-ft of torque.


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  #11  
Old 03-16-2011, 05:00 PM
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Thats cool info thanks! I get it totally now. After visualizing the tires being the same height and changing the rear gears out the rpms change not the mph's.
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Old 03-16-2011, 05:41 PM
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Glad I could help I know, everyone always just says: "change gears to bigger" and everybody wants 'bigger' gears, but you need to look at what you want out of them and why you want to do the swap.

For the OP, the reason his vehicle's speedo changed with gears was his vehicle took the speed measurement from a point BEFORE the rear diff, so in that case it would cause a change. Just not in the case of our trucks which take it from a location after the gears.
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Old 03-16-2011, 06:23 PM
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Good info thanks, ya I wanna go 35's and my gears are long enough all ready, good to know my mph will stay the same thanks
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Old 03-16-2011, 09:07 PM
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the tone ring for the speed-o is in the rear axle...has been since '98 IIRC. if you swap gears your speed-o will still read accurate. no changes needed.

like others stated you will need to recalibrate your speed-o with a different tire size.
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Old 03-16-2011, 11:22 PM
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Quote:
Originally Posted by gabrieldy View Post
the tone ring for the speed-o is in the rear axle...has been since '98 IIRC. if you swap gears your speed-o will still read accurate. no changes needed.

like others stated you will need to recalibrate your speed-o with a different tire size.
Did some serious digging, and ..... You are 100% correct!
I stand corrected...

As it turns out, you can go gear happy in your Ram, and not affect the speedo, but a tire size change will affect it.

Thanks to all for bringing this tidbit of information out in the open. Having not done a gear change in any of my newer Rams, I assumed it was still taking the speedo information from back of the trans. WTG Dodge! AND WTG Ram ForumZ!
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