Freaky Speedometer
More Turbo
Joined: May 2006
Posts: 723
Likes: 13
might not be related to your speedo problem , but I had a bounceing needle totally unreadable , not sure if the odometer was acurate but the problem was the sensor under the ring gear in the rear axle,,,,,,,,,, put a new one in and speedo is as should be......... I had a previous rear gear axle problem which in turn wrecked the speed sensor......
Hotshot
Joined: Aug 2006
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Cargo Master
Joined: Jul 2006
Posts: 2,756
Likes: 38
From: Nampa, ID
Craig- does the speedo bounce at all, or does it just quit? If it just plain quits it might be wiring like Rick said. When my PSOM quit me, it quit me once going down the freeway between Twin and Boise... just flat quit for a few miles then sprang back to life after I thumped the dash a few times. Went along fine for a week or so, then I started getting a bouncing speedo, and I mean REALLY bouncing- would go from 40 to 70 at around 65 mph. Definitely check the wiring before you go spending $ on parts. It also wouldn't hurt to pull the VSS out and wipe it off to see if that helps.
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Cargo Master
Joined: Jul 2006
Posts: 2,756
Likes: 38
From: Nampa, ID
might not be related to your speedo problem , but I had a bounceing needle totally unreadable , not sure if the odometer was acurate but the problem was the sensor under the ring gear in the rear axle,,,,,,,,,, put a new one in and speedo is as should be......... I had a previous rear gear axle problem which in turn wrecked the speed sensor......
I have a non-limited slip differential. If it has to be removed or rebuilt, I'd probably go with a limited-slip unit just for the heck of it. I would think it would be much of a cost difference between rebuilding the non-limited slip unit versus installing a limited-slip unit.
I wouldn't be able to this myself. I'd hafta take it to the dealer or some other shop.
Lead Driver
Joined: Oct 2003
Posts: 8,476
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From: Madison, WI
We like to say that "the problem has been isolated to between the keyboard and the chair"...
Senior User
Joined: Oct 2006
Posts: 332
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From: Emmett, ID
And If you had ever met Craig, you would agree on PEBKAC...
So, I translated the acronym it into AutoSpeak....
HOWEVER I don't know that I would be surprised to be driving down the road and look over to see Craig driving down the road with a keyboard on his steering wheel trying to type something into the FTE forums! (Or the ITD forums)...
Postmaster
Joined: Sep 2007
Posts: 4,195
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From: Medford Oregon
Since no one has mentioned this when it happens wiggle the ignition switch and see if the odometer lights back up. As the truck ages going from RUN > START then releasing the key sometimes the it will not go all the way back to the RUN position. The Key has to be in the RUN position for the odometer and the sped-o to function, ie (light up).
More Turbo
Joined: May 2006
Posts: 723
Likes: 13
Did you replace this yourself? What is involved in doing this?
I have a non-limited slip differential. If it has to be removed or rebuilt, I'd probably go with a limited-slip unit just for the heck of it. I would think it would be much of a cost difference between rebuilding the non-limited slip unit versus installing a limited-slip unit.
I wouldn't be able to this myself. I'd hafta take it to the dealer or some other shop.
I have a non-limited slip differential. If it has to be removed or rebuilt, I'd probably go with a limited-slip unit just for the heck of it. I would think it would be much of a cost difference between rebuilding the non-limited slip unit versus installing a limited-slip unit.
I wouldn't be able to this myself. I'd hafta take it to the dealer or some other shop.
BTW I bet your speedo problem is else where and not related to the rear axle, I only mentioned it cause these trucks are so much more complicated than they use to be and it nice to gain more understanding on how things work, the speed sensor was a new learning thing for me too....
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Cargo Master
Joined: Jul 2006
Posts: 2,756
Likes: 38
From: Nampa, ID
Also, there are 10 types of people in the world, those that understand binary and those that don't.
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Cargo Master
Joined: Jul 2006
Posts: 2,756
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From: Nampa, ID
Ah Correct MadPogue!
And If you had ever met Craig, you would agree on PEBKAC...
So, I translated the acronym it into AutoSpeak....
HOWEVER I don't know that I would be surprised to be driving down the road and look over to see Craig driving down the road with a keyboard on his steering wheel trying to type something into the FTE forums! (Or the ITD forums)...
And If you had ever met Craig, you would agree on PEBKAC...
So, I translated the acronym it into AutoSpeak....
HOWEVER I don't know that I would be surprised to be driving down the road and look over to see Craig driving down the road with a keyboard on his steering wheel trying to type something into the FTE forums! (Or the ITD forums)...
You even changed the acronym this time. How am I supposed to keep up?
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Cargo Master
Joined: Jul 2006
Posts: 2,756
Likes: 38
From: Nampa, ID
Since no one has mentioned this when it happens wiggle the ignition switch and see if the odometer lights back up. As the truck ages going from RUN > START then releasing the key sometimes the it will not go all the way back to the RUN position. The Key has to be in the RUN position for the odometer and the sped-o to function, ie (light up).
Tried to rep, but you know the story. Gotta spread the love around first.
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Cargo Master
Joined: Jul 2006
Posts: 2,756
Likes: 38
From: Nampa, ID
Mooseman, I sent the truck to a heavy truck repair shop , the speed sensor was actually a freebe on them, the whole story is that back in Feb 08 I busted 3 teeth on the Dana 70 ring gear while plowing snow the shop next day aired my parts got me up and running in 3 days, the speed sensor problem was imediate but being a work truck I did not bring it back right away cause I work with the truck every day . It was a lot of work for them but they said that the speed sensor should have been ordered with the ring gear but they thought it was good to go, total cost was 1323.00 dollars I thought was not bad considering the ring gear and next day aire charges was around 300 dollars.......
BTW I bet your speedo problem is else where and not related to the rear axle, I only mentioned it cause these trucks are so much more complicated than they use to be and it nice to gain more understanding on how things work, the speed sensor was a new learning thing for me too....
BTW I bet your speedo problem is else where and not related to the rear axle, I only mentioned it cause these trucks are so much more complicated than they use to be and it nice to gain more understanding on how things work, the speed sensor was a new learning thing for me too....
Lead Driver
Joined: Oct 2003
Posts: 8,476
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From: Madison, WI
Did you know that Halloween equals Christmas? Yeah, OCT 31 = DEC 25 .
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Cargo Master
Joined: Jul 2006
Posts: 2,756
Likes: 38
From: Nampa, ID
Haven't heard this one. Please explain. A new learning opportunity for me arises once again.