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speedometer wont go over 40mph

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Old Nov 4, 2009 | 02:46 PM
  #16  
remmers's Avatar
remmers
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Mountain Pass
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From: Michigan
should i change the rear diff fluid, and see if that makes a difference?
 
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Old Nov 4, 2009 | 03:58 PM
  #17  
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fifthwheel01
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Were there a LOT of metal shavings attached ( magnetic) to the sensor when you pulled it out?
 
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Old Nov 4, 2009 | 04:19 PM
  #18  
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remmers
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Originally Posted by fifthwheel01
Were there a LOT of metal shavings attached ( magnetic) to the sensor when you pulled it out?
a few but i wouldn't say a lot. I really had to look to find any
 
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Old Nov 4, 2009 | 08:20 PM
  #19  
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ok took out he rear sensor (vss) made sure it was ok (it is brand new), checked the harness and took her for a drive. Still the same thing. Truck runs great, but will not move past 40 on the speedo.?????
 
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Old Nov 4, 2009 | 09:32 PM
  #20  
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fifthwheel01
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when i bought the first one for my truck at a local parts house it was a bit different than the OE that came out of it. Round metal cylinder base instead of the plastic with three concave sides. Then I had trouble again, My speedo would jerk or not work at all and the brake pedal would just feel wierd, I went to FORD for an OE replacement, worked perfect, ended my problems.
 
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Old Nov 8, 2009 | 09:49 PM
  #21  
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remmers
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one thing i forgot to mention, i had 315/75/16 tires on the truck before this started happening. I changed the tires to 285/75/16's and i noticed this happening.

I am at a loss as to why the speedo wont go over 40 mph

The truck does run fine, but it does seem to down shift a little hard
 
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Old Nov 9, 2009 | 07:42 AM
  #22  
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koski19
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When I was turning wrench for a GM dealership. When a problem came in like no speed, no tack or an erratic needle or a gauge that didn't work correctly. After troubleshooting, I found that the problem ended up being in the cluster and needed to be replaced or removed and sent in for repair. Just my 2 cents.
Jeff
 
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