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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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  #1  
Old 12-10-2010, 12:12 AM
70blackfish 70blackfish is offline
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Default with 4.56 gear my Speedo is off

what do I change, I have a stock srt-10 rear axle with 4.56 in my truck. I replaced the 9.25. were is the speedo sensor, the one in the rear axle is the stock one from the srt-ram.
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  #2  
Old 12-10-2010, 06:38 AM
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I think you need to use a handheld programmer to update your 3rd gen PCM.
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Old 12-11-2010, 12:07 AM
70blackfish 70blackfish is offline
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Default 4.56

Hypertech says theres doesnt work on 2004 model..
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Old 12-11-2010, 12:19 AM
RootBeer RootBeer is offline
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The dealer can do it, maybe even for free.
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Old 12-11-2010, 04:13 AM
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when i did my gears the speedo adjusted by itself i dont know about srt axle though
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Old 12-11-2010, 05:56 AM
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I was thinking a Diablo Preditor Tuner would work also. Maybe give them a call and see what they think. Might even be able to fool with putting in a different tire size to fool the odometer.
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Old 12-11-2010, 11:33 PM
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I agree with the above. I have adjusted the speedo with my Diablo Sport Predator by changing the tire size. You can just do that to fool the truck

I really fooled my truck with this. I have 35" tires and I think I set the tire size to 27". The truck reads 24% slower then I am actually going. This is keeping my miles down, just want to make them go up slower hahaha. Only problem is the computer on the truck is all messed up. My MPG reading is horrible since it is all wrong. Doesn't bother me though, as long as I can keep the miles down on the truck I'm happy
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Old 12-14-2010, 09:46 PM
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Quote:
Originally Posted by 70blackfish View Post
what do I change, I have a stock srt-10 rear axle with 4.56 in my truck. I replaced the 9.25. were is the speedo sensor, the one in the rear axle is the stock one from the srt-ram.
i dont think there is an easy fix for this as the axle you installed is from an srt-10.....they way the two trucks read speed is different......im pretty sure the tone ring is different......
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Old 12-14-2010, 10:40 PM
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Since they take their speed readings differently I would use Scat's advice and trick f*%k the speedo. If your speedo reads fast use a handheld programmer to input a larger tire size. If it reads slow put in a smaller tire size. Drive around with a gps until you fine tune it to your liking. Kinda like using a band-aid for the problem but it'll get you by.
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Old 12-14-2010, 10:58 PM
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Default to fix the speedo in dash so it reads correct speed

use the preator tuner and a gps, addjust shift points and tire size to get it right
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