vehicle speed sensor (VSS) question

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May 3, 2006 | 03:20 PM

MikeSDK

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Joined: Feb 2006

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From: Tennessee

vehicle speed sensor (VSS) question

I have seen on other posts where people have replaced their VSS in order to resolve a condition where the O/D light blinks and the speedometer is not operating.

I have that condition periodically, and plan to change mine this weekend. My question is if there is more than one of these-

two different people I have talked to with Ford indicate that there is one for the 'pumpkin' on the rear axle (which is the one I know about) and also one for the transmission.

Are there actually two, and if so, how do I know which needs replacing?
Can I access the one in the tranny (if it exists) from the comfort of my driveway? Its for a 2002 F250 7.3.

Thanks

May 3, 2006 | 03:25 PM

zx250

Of the next Riffraff East

Joined: Oct 2004

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From: Concord NC

Just the one on top of the "Pumkin". Or at least that's the one that you need to replace.

May 3, 2006 | 03:46 PM

Jerme

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From: Oregon

The one in the diff is actually called the RABS (rear anti-lock brake sensor) and the actual speed sensor is in the tranny somewhere. Actually, I think I've heard someone on here say it's somewhere between the tranny and transfer case.

May 3, 2006 | 06:07 PM

piotrsko

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From: Reno nv

Rabs on the diff, VSS on a manual 6 spd somewhere. also some sort of interconnectiom between the two possibly PCM.

Vss failure sets SES light and provides code, no speedo indication below 55.

Haven't broke the rabs yet.