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Old Aug 13, 2013 | 08:25 PM
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Speed Sensor
I have a 96 F350 CC E4OD. Replaced speed sensor in rear end now Speedo fluctuates 2-5 mph. I have installed two sensors, the first one did not seal, speedo did same thing. Thanks for any help.
 
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Old Aug 13, 2013 | 08:49 PM
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I've got same issue bud....before I replaced it speedo didn't bounce at all now speedo bounces and tranny shifts like crap.......where did you buy the sensors from? Mine was from the ford dealership
 
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Old Aug 13, 2013 | 10:41 PM
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Check the wiring going to the VSS real good. It can get corroded and moving it around changing the sensor could have caused a problem. Just a thought.
 
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Old Aug 13, 2013 | 10:51 PM
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I checked it up to where it goes into the rest of the rear harness and it was all good
 
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Old Aug 14, 2013 | 09:36 AM
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I got the Sensor from O'Reilly Auto Parts.

Jim
 
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Old Aug 14, 2013 | 11:26 AM
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Also check the tone ring in the diff. Crud between the notches can throw the sensor off. I've heard even foreign matter in the diff fluid can do it.
 
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Old Aug 14, 2013 | 01:37 PM
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I would say try a motor craft sensor but as of now I can't be sure that they are the best either......I'm taking my truck in to a guy that all he does is build HD trannys for Cummins and powerstroke sled pullers to have him check mine all out wiring and all he said its free because he knows one day I'll be back down there to replace my stock tranny with a built unit
 
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Old Aug 15, 2013 | 05:18 PM
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Got a wiring pigtail from Ford and installed today. No Help, still same prob. It does seem to get worse at higher speeds.

I think I am going to change Rear End oil and check tone Ring. Is any one using Synthetic in Rear Gear. If so what.

Jim
 
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Old Aug 15, 2013 | 05:34 PM
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I used synthetic Lucas in mine just FYI I'm having similar issues and after the change it didn't help
 
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Old Aug 15, 2013 | 06:53 PM
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Check the air gap between the sensor and tone ring. Max spec is 0.045". Mine was at max spec and I sanded down the mounting face of the sensor to bring the gap to 0.020" and the needle is very solid now.
 
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Old Aug 15, 2013 | 07:02 PM
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Originally Posted by kawamatt2
Check the air gap between the sensor and tone ring. Max spec is 0.045". Mine was at max spec and I sanded down the mounting face of the sensor to bring the gap to 0.020" and the needle is very solid now.
Wow great info I never thought about gap spec I hope that's my problem lol that would be glorious haha
 
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Old Aug 15, 2013 | 07:48 PM
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Question
Originally Posted by kawamatt2
Check the air gap between the sensor and tone ring. Max spec is 0.045". Mine was at max spec and I sanded down the mounting face of the sensor to bring the gap to 0.020" and the needle is very solid now.
Good but I have questions: How do you meassure that air gap? Do you have to pull the rear diff cover?

Originally Posted by 95350PS
Wow great info I never thought about gap spec I hope that's my problem lol that would be glorious haha
Yeap good info. Rep sent.

 
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Old Aug 27, 2013 | 07:35 PM
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Finally got back to my problem. BINGO!!!! Air gap fixed it, took about .015 off of mounting flange speedo is rock solid. Thanks Kawamatt2 Great info.

Jim
 
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Old Aug 27, 2013 | 08:08 PM
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Question
Originally Posted by RÖENTGEEP
Good but I have questions: How do you meassure that air gap? Do you have to pull the rear diff cover?



Yeap good info. Rep sent.

Originally Posted by Blankie
Finally got back to my problem. BINGO!!!! Air gap fixed it, took about .015 off of mounting flange speedo is rock solid. Thanks Kawamatt2 Great info.

Jim

Again I ask, how do you meassure or fix the air gap?

 
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Old Aug 27, 2013 | 08:11 PM
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I would guess cover has to be removed but I just filed off a little at a time and tested till it was a solid speedo needle
 
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