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Speedometer problem 1996 F150

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Old Nov 3, 2007 | 08:08 AM
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Question Speedometer problem 1996 F150

Can someone help..My speedometer fluctuates once I reach 65 MPH back and forth 5 miles. I have changed the speed sensor in the rearend. My truck is also a 2 wheel drive. Truck runs great just this problem. Any advise will be greatly appreciated.
 
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Old Nov 3, 2007 | 08:24 AM
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From: Central PA
Welcome to FTE . You your posom (center cection "speedo") May be going bad . You could try swapping another in to check .

But wait for more posts . There are guys on here that know just about every thing about these trucks . Good luck
 
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Old Nov 3, 2007 | 10:34 AM
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From: Easton,Ks
You either have a bad PSOM, Speedometer Head or tone ring in the rear end.
You need to put it on jack stands and put a scope on the VSS signal coming from the rear end. See if the pattern changes while you hold the speed constant and the speedometer is jumping.
You could also use a frequency meter.
 
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Old Nov 4, 2007 | 06:43 PM
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Thanks

I will try this and post back with my findings. I appreciate the info.
 
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