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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Speedometer Bouncing

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Old Sep 10, 2023 | 04:33 PM
  #16  
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mcassett
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Originally Posted by My4Fordtrucks
Disconnect/ unplug.

Yes, it will, which is why he said that the signal can be weakened when it goes through the RABS module. Unplugging the module will allow the PSOM to get a stronger signal. If the speedometer is better then you have found the problem.

Just tried pulling the RABS module, which is right behind the glove box. The glove box can be tricky to take out but you just open it up and squeeze in the bin from the left side and the right side so the stopper doesn't make contact with what usually stops it. After that it pulls all the way down and comes right out. I took two screws out of the module to easily disconnect the wiring. When I drove the truck, nothing changed. Thank you for that suggestion, one step closer to figuring this out.

 
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Old Sep 16, 2023 | 07:27 PM
  #17  
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Update on Speedometer

I took my dash and cluster apart and visually inspect the PSOM. Doesn't look like anything is visibly wrong, but I assume capacitors or something else must be at fault.

I plan on sending it into Texas speedometers on eBay, does anyone have any experience with them? Roughly how long should I expect to be out of commission for?

Could I start my truck without my cluster plugged in? What about drive it? Plan on doing some transmission maintenance in the meantime.

Mike
 
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Old Sep 17, 2023 | 12:34 PM
  #18  
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Yes. It will start and drive, but the transmission won't receive a speed signal so it'll shift crazy.
 
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Old Sep 17, 2023 | 08:40 PM
  #19  
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Originally Posted by mcassett
Just tried pulling the RABS module, which is right behind the glove box. The glove box can be tricky to take out but you just open it up and squeeze in the bin from the left side and the right side so the stopper doesn't make contact with what usually stops it. After that it pulls all the way down and comes right out. I took two screws out of the module to easily disconnect the wiring. When I drove the truck, nothing changed. Thank you for that suggestion, one step closer to figuring this out.
I unplugged this to fix my speedo. I didn't undo any screws. I pulled the plug at the end of the box on the right side. It has a big clump of wires on the plug. Is that what u unplugged? I never did anything with screws.
 
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Old Sep 18, 2023 | 02:21 PM
  #20  
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Originally Posted by Ronniewhite
I unplugged this to fix my speedo. I didn't undo any screws. I pulled the plug at the end of the box on the right side. It has a big clump of wires on the plug. Is that what u unplugged? I never did anything with screws.

That wiring harness connects to the RABS module so you need to remove it. I took the screws out of RABS module.so it was easier to remove wiring harness.
 
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Old May 27, 2024 | 10:33 AM
  #21  
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From: Kingsport
Automatic transmission?

Originally Posted by Ronniewhite
I unplugged this to fix my speedo. I didn't undo any screws. I pulled the plug at the end of the box on the right side. It has a big clump of wires on the plug. Is that what u unplugged? I never did anything with screws.
Does your truck have an automatic transmission? I’m curious if the RAB module can cause the bouncing speedometer at 70 MPH?
 
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Old May 28, 2024 | 12:45 AM
  #22  
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Yes E40D. Still working great.
 
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