New 4.56 gears installed and now traction control problems - Ford Powerstroke Diesel Forum
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Old 01-05-2011, 09:51 PM
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New 4.56 gears installed and now traction control problems

Just had a set of 4.56 gears installed on my '08 f-350 srw and now the traction control is kicking in randomly. I'm assuming the speedo has to be recalibrated for the gears??? Just looking for some answers. thanks
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Old 01-06-2011, 04:15 AM
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yes on the speedo, the gear is like putting a sjort tire on it.
idk about traction control?
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Old 01-06-2011, 09:20 AM
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Quote:
Originally Posted by tricktom1 View Post
yes on the speedo, the gear is like putting a sjort tire on it.
idk about traction control?
Wrong. The ABS tone ring on the rear axle that the speedometer is read from is located on the carrier, so gear ratio does not affect the speedometer, only tire size does.
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Old 01-06-2011, 05:28 PM
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I guess i don't see the difference, if it has a lower gear the axle will spin faster at a given rpm just like if you had a short tire.
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Old 01-06-2011, 06:14 PM
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The speed is measure after the differential, on the carrier, not at the transmission like they used to. So, gear ratio does not affect the speedometer, but tire size does. I realize I pretty much just said the same thing, so I guess I can't pit it any simpler.
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Old 01-06-2011, 06:27 PM
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.................

Last edited by tricktom1; 01-06-2011 at 06:32 PM.
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Old 01-06-2011, 06:40 PM
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it measures axle shaft/carrier speed. which does not change with gears. the transmission shifts with mph. so if nothing was re-calibrated, the truck is running more rpms then the tcm is use to, its probably shifting too late and hitting the rev limiter.
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Old 01-06-2011, 07:11 PM
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Check for ABS codes. If the rear tone ring wasn't installed correctly or the speed sensor is dirty, it can cause false readings and mess with ABS and traction control.
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Old 01-06-2011, 09:00 PM
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No ABS lights or any alkward shifting. If i leave the traction control on then sometimes it kicks on. If I just leave it off theres no problem, runs fine. I will say though these 4.56's are sweet!
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Old 01-06-2011, 09:07 PM
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what size tires?
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