Speedometer Bounce
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Trailering
Joined: Aug 2023
Posts: 18
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Speedometer Bounce
I've looked around online and can't find a solution so I thought I'd ask here: I've got a 1996 f250 with a 7.3 and the speedometer bounces by about +- 15mph with the BABS module plugged in. It'll start once I achieve ~35mph. I don't have any ABS lights that come on or anything. When I unplug the BABS module it runs fine until ~65mph. The only thing I can think of is the PSOM at this point but wanted to get some feedback before I pulled the trigger. Other symptoms would be I've had the speedometer and the odometer completely shut off on my for a split second while driving. I also have the OD randomly come on when it's raining but I think that's a whole nother issue.
Hotshot
Joined: Dec 2005
Posts: 14,375
Likes: 604
From: evansville in
I am fighting an issue very similar . My speedo was very slow to come up and would at times mess up the 1-2 shift. I replaced the vss with a standard one. My issue got mostly better. I pulled diff cover to check tone ring and carrier bearings. All was well so I got an oem vss as I still had a slight hunt at 65 so cruise control was not usable. I think so far the speedo is steady enough to use cruise...we are going camping this coming weekend and I would like to not wear my right foot out...
Cargo Master
Joined: Jul 2010
Posts: 3,014
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I've looked around online and can't find a solution so I thought I'd ask here: I've got a 1996 f250 with a 7.3 and the speedometer bounces by about +- 15mph with the BABS module plugged in. It'll start once I achieve ~35mph. I don't have any ABS lights that come on or anything. When I unplug the BABS module it runs fine until ~65mph. The only thing I can think of is the PSOM at this point but wanted to get some feedback before I pulled the trigger. Other symptoms would be I've had the speedometer and the odometer completely shut off on my for a split second while driving. I also have the OD randomly come on when it's raining but I think that's a whole nother issue.
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Trailering
Joined: Aug 2023
Posts: 18
Likes: 1
Sorry for taking so long on the update. What I found out was that the sensor was bad. Everything looked a-okay on the outside but the internals must have been damaged. Ended up using one from Standard Motor Products and it's been running smooth ever since. I also used some dielectric on it but I don't know if that ended up being necessary or not. I would say to try this since it's a ~$20 part. I've seen some people say that if your truck is shifting very rough along with the wobbling speedo, then it is most like a PSOM issue. But I would try the speedometer sensor first.
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