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Speedometer issues, stops at 38mph, please help!

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Old Sep 17, 2015 | 01:10 AM
  #1  
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Speedometer issues, stops at 38mph, please help!

My speedometer was intermittent for a while, stalling, then moving, but never above the actual speed. Now I turn it on, but as soon as I move, it travels up to 38mph then stays there until I turn off the engine, then it hangs for 4/5 seconds, then drops to zero.

I replaced the VSS in the rear diff, and the one on the tranny. I checked all fuses. There are no other dummy lights or indications. Bad ground? I'm hoping I don't need a new gauge cluster.

Any and all help appreciated!
 
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Old Sep 17, 2015 | 12:23 PM
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I had this happen to one of the work trucks, replaced the same things you did, my resolution was I got hot headed and whaked the dash cluster end of problem. Hope this helps
 
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Old Sep 17, 2015 | 02:47 PM
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The old maintenance tap! I haven't tried that but I'm getting to that point. Maybe I'll take the cluster out and unplug wires and put them back in. Otherwise I'm stuck, unless I get a new cluster.

I checked the ground wire responsible for the speedo and tranny (I think, based on another thread), and it was perfect.

The problem with a new cluster is that I bought this 99 specifically because it was completely original/stock with 68k miles on it. If I get a new cluster then my resale value will def take a hit.
 
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Old Sep 17, 2015 | 07:10 PM
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Mine stops at 100, have to use gps after that
 
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Old Sep 17, 2015 | 07:40 PM
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Originally Posted by mysherona
The old maintenance tap! I haven't tried that but I'm getting to that point. Maybe I'll take the cluster out and unplug wires and put them back in. Otherwise I'm stuck, unless I get a new cluster.

I checked the ground wire responsible for the speedo and tranny (I think, based on another thread), and it was perfect.

The problem with a new cluster is that I bought this 99 specifically because it was completely original/stock with 68k miles on it. If I get a new cluster then my resale value will def take a hit.
You can always take apart the gauge cluster and swap the mileage part of it
 
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Old Sep 17, 2015 | 08:30 PM
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From: Pensacola
When this happened to me I sanded all ground contacts and added 0 gauge wire for each ground besides the back of the motor that I could not reach and it cured it.
 
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