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Old 01-15-2011, 07:57 PM
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Rear Axle

Just wondering if you guys can tell me what the plug on the top of my 3L axle is?

I was airing up my tires today and saw this electrical plug mounted just above where my drive shaft enters the rear axle housing.

Any help would be great, thanks
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Old 01-15-2011, 08:35 PM
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Its the VSS -speed sensor/abs sensor for the rear axle.
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Old 01-16-2011, 06:05 AM
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speed sensor part helps the tranny shift
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Old 01-16-2011, 07:52 AM
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Pretty interesting thanks guys. I would have never guessed thats what it was. My F150 didnt have one of those and it was an 06 also. It had a tow feature like the F350 but in respect all it really was is an OD lock out. The F350 will down shift automatically and such.

I dont quite understand how it helps the ABS system though. I always thought these were sensors at each wheel? Or is that mostly just on cars?

I know i have 4 wheel ABS due to the fact the other day on the highway when it was raining everyone decided to power stop to look at something on the side of the road and i stomped the brakes as i was already going downhill and i felt the ABS on.
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Old 01-16-2011, 01:16 PM
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The ABS in the rear is on the input shaft and not at individual wheels
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Old 01-16-2011, 01:54 PM
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the tendency of your brakes locking up comes mostly from the front esp with 4 wheel disc. there's really no need for individual ws sensors in the rear

btw on a 10.5 the rear sensing ring is on the carrier under the ring gear
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