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Low Trac Light on and off when on highway

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Old 10-14-2010, 01:56 AM
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Default Low Trac Light on and off when on highway

Hey guys, So I recently installed a MWC fab 9" rear end. So in town cruising the Trac light is off, it seems the Trac light only comes on when im above 60mph. Ill be cruising on the highway and the light will come on for a few seconds, then turn off, the light is not triggered by any bumps in the road. Just turns on and off sporadically. When I get off the highway the light stays off. Any ideas?
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Old 10-14-2010, 03:28 AM
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Loose speed sensors would be my guess.
Old 10-14-2010, 01:05 PM
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I'll check that today, sounds like a reasonable guess. Thanks man
Old 10-14-2010, 03:12 PM
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sorry for the dumb question, but where are the speed sensors? did you mean the traction sensors that bolt to the backing plate with one screw?
Old 10-14-2010, 05:27 PM
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Yes that's what he meant.
Old 10-14-2010, 09:30 PM
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are your wheels staggered? if so what size and what size tires ya got
Old 10-14-2010, 11:56 PM
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Wheels are staggered. Fronts are 18x9.5" w/ 275/35/18. Rears are 18x10.5" w/ 295/35/18. I have had this wheel combo since 2005. The low trac light problem just start after installing a Midwest fab 9 rear end. I messaged Midwest chassis and he asked if I programmed my computer to 3:50 gear ratio since stock was 3:42's. I have not reprogrammed the computer yet. Would you think that would mess with the sensors?
Old 10-15-2010, 12:19 AM
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In my experience, the computer will trip when it sees different speeds from the front vs. the rear wheels. When my car came off the dyno, it was lit up like a Christmas tree on the dash. Drove it a few miles and they all reset themselves. So if one sensor is giving a false reading, or tires sizes aren't the same, the computer will pick this up as an error.
Old 10-15-2010, 12:11 PM
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Do you have to have hptuners to change the fear ratio in the computer or will a handheld programmer work?




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