NEED HELP! ABS Tone Ring issue?? - Ford Powerstroke Diesel Forum
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Old 07-25-2011, 05:55 PM
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NEED HELP! ABS Tone Ring issue??

Okay, been dealing with this issue for the past couple of months. I recently re-geared my 08 f250 to 4:56 gears from the stock axle ratio. Truck has 38 inch tall tires. Ever sence the install i have to turn the Traction Control off to go above 40 MPH. If I forget to turn it off, the ABS kicks in and the truck freaks out, hit the button, and all is fine, and i can drive normal. Truck ran fine before install. Did some research and from what i found is that changing the axle ratio has nothing to do with tranny performance or that nature. However tire size does. Correct me if im wrong. Our auto trannys work off MPH. So if you changed tire size you will need a tunner that will allow you to change the size for the TCM. I did that, and still have the problem. I came accross a part called an "ABS Tone Ring" located inside the rear diff. Could this have gotten damaged during the swap? Could that be my problem? Its about the only idea I have left before I take the truck to the dealership. Any input would be great! thanks guys!
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Old 07-25-2011, 06:25 PM
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it's a toothed ring that is pressed on underneath the gear. it could be damaged but really I'm unsure why that would cause the issue you're having. if anything it would just set an ABS light for the speed signal missing

changing the tire size and axle ratio does the same thing, both are programmable through a scantool like IDS. Something in the pcm must be seeing vehicle speed and RPM differences it doesn't like

did you call around any truck performance shops and see what they have to say?
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Old 07-25-2011, 06:40 PM
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they all seem not to know, or they point me in the direction of useing a tunner to change the gear ratio. My tunner (SCT Livewire) doesnt offer that option. I thought tire size was the only factor that mattered. It looks like most tuners for the 6.4 only offer "tire change" vs "gear ratio change". I got the idea of the ABS tone ring from a older thread on here ( I think) and the guy was having the same problem im having, but the sulution never got answered, the thread died.
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Old 07-26-2011, 02:59 PM
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you could always pull the rear cover and check it out. since it's new fluid you should be able to reuse it
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