when im at idle at a stop light or stop sign, my speedometer jumps up and down. kinda bounces. anyone know what this could be?
thanks
-Luc

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2001 XLT 4x4 V6 4.0L auto
SAS'd D44 and 8.8. dual lockers, 38s, 12 bolt h1's, some other odds and ends

bump

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2001 XLT 4x4 V6 4.0L auto
SAS'd D44 and 8.8. dual lockers, 38s, 12 bolt h1's, some other odds and ends

This occurs only when u hit a bump?

check your oss sensor is on your trans or transfer case other than that it really sounds like the needle is binding wonder if those modules can be RR'd seperately or if the entire cluster has to b changed out.

Check your VSS (Vehicle Speed Sensor). I have found most speedo problems stem from a bad VSS. Other symptoms are rough shifting and O/D flash. The sensor is located on top on the rear diff. check out this post.
http://www.ford-trucks.com/forums/51...ed-sensor.html

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(SOLD) 2003 Ranger 4.0L V6 FX4
2001 F150 Supercrew Triton V8 (DD)
2008 Fusion 3.0L SEL V6 (my baby)
1992 Taurus SHO MTX (my toy-almost Supercharged)
2004 Nissan Murano SL AWD (Wife's car)

It is possible that the 2001 uses the output shaft speed sensor on the trans/transfer case can anyone verify?

Yes the 2001 has a OSS on the upper driver side rear of the tranny. I believe the OSS sends info to the computer for proper transmission function. It works in conjunction with the VSS. If in question go to a parts store and get the codes. That should answer the question. Hope this helps.

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(SOLD) 2003 Ranger 4.0L V6 FX4
2001 F150 Supercrew Triton V8 (DD)
2008 Fusion 3.0L SEL V6 (my baby)
1992 Taurus SHO MTX (my toy-almost Supercharged)
2004 Nissan Murano SL AWD (Wife's car)

thanks a lot guys it was the sensor

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2001 XLT 4x4 V6 4.0L auto
SAS'd D44 and 8.8. dual lockers, 38s, 12 bolt h1's, some other odds and ends

i hope you dont get the same problems i have had where on my 97 my speedo would jump from whatever my speed to was 99mph then drop to 0 then after awhile it would go back to normal i replaced my VSS and no go i couldnt even get the new sensor in!! i had to force the thing in and still didnt work and yes i went to other parts stores and bought about 4 different VSS sensors and notta thing they all did the same thing

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Never tell people how to do things. Tell them what to do and they will surprise you with their ingenuity."
General Geroge S Patton
2007 3.0
automatic trans, 4.10s with L/S
ported and polished TB
4brand new speakers with inslation in doors
smoked tail lights
20%tint on driver and passenger windows
5% tint on back window

I know this is an old thread but I was wondering which sensors that you replaced that fixed the problem?

I am havin gthis same problem and it is driving me nuts becaues it is bouncing up an ddown on the needle from when I am not moving, when I am moving the speedometer works perfectly find but I do hear what sounds like a high pitched static noise behind the dash...

-Nigel

Mine used to do that and it was the battery, I had to replace it... Once I did it stopped...