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Discussion Starter #1
I've searched here and the threads I found do not quite match my problem. My speedo needle spikes backwards about 10 MPH at 70. I have to be doing 70 or higher for it to start jumping around. Still think it's the VSS? Thanks!
 

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I have read something about the speedos causing that problem. There are other possibilities...VSS...PSOM...If the tranny is shifting OK(auto) and no ck eng light, Most likely speedo. VSS would also likely set off the ABS light, same for PSOM, IIRC.
 

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Discussion Starter #3
I just bought the Bronco and have no scan tool to check for codes. There is no check engine light and the tranny seems to be shifting fine, but I have nothing to compare to. I'll just bring it to the garage and get a professional opinion. Thanks.
 

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Take off the rear diff cover. Check the Ring Tone gear. It is located on the left hand side of the ring gear. Look to see if any of the teeth have been notched (from debris floating around in the diff.) Usually a spider gear. If the ring tone gear has been notched, it will need to be replaced to fix your speedo reading. Jack it up and rotate the tires to look for the teeth to be notched/broken/bent...
 

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Discussion Starter #8
Bighibbi said:
Take off the rear diff cover. Check the Ring Tone gear. It is located on the left hand side of the ring gear. Look to see if any of the teeth have been notched (from debris floating around in the diff.) Usually a spider gear. If the ring tone gear has been notched, it will need to be replaced to fix your speedo reading. Jack it up and rotate the tires to look for the teeth to be notched/broken/bent...
Thanks and that makes sense as I'm having rear diff issues. I'll be rebuilding rear this week. Previous owner let rear diff run low on fluid. :madder
 

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I highly doubt it's the ring tone gear, I would suspect the sensor before that. A few silver particles in the oil wont affect anything. If it is suggested that a tooth broke and then damaged the teeth on the ring tone gear, then there would be other more serious issues going on. If I were you I would diagnose the sensor.
 

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Discussion Starter #10
waltman said:
I highly doubt it's the ring tone gear, I would suspect the sensor before that. A few silver particles in the oil wont affect anything. If it is suggested that a tooth broke and then damaged the teeth on the ring tone gear, then there would be other more serious issues going on. If I were you I would diagnose the sensor.
Thanks. I'll have the rearend apart this week and I'll just have my buddy run a scan on it. I just thought a check engine light would be triggered if the VSS was bad. I'm hoping for the best.
 

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You don't have to rip apart your rear end to check the sensor, it is located on top of the pumpkin.

 

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Discussion Starter #12
waltman said:
You don't have to rip apart your rear end to check the sensor, it is located on top of the pumpkin.

Thanks for the pic, but I really do need to tear into the rear diff. I posted earlier that the previous owner ran it low on fluid amd it's just a howlin'! I bought a new install kit and an Auburn limited slip to install this week. Hopefully the ring and pinion is fine.
 

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Discussion Starter #13
Steve83 said:
That's exactly what causes "attitudes"... :shrug If you had either included that little tidbit of info in your first post, or (even better) posted this question in the old thread, it would have saved us all a LOT of time & typing. :twak

There's a reason they're called "threads". ;)
I don't know what your problem is, but you've taken a tone with me since I first posted. I'm new here and you haven't given me one iotta of a chance here. You are the only one in this thread with an attitude. I posted best as I knew and I made no claim to be a pro hence my questions here.

I had'nt even thought about the rearend problem relating to the speedo acting up until "Bighibbi" posted. At least the others have tried to be helpful. What have you contributed? All I asked is if anyone else had experienced my same problem. If you don't have anything good to say; keep it to yourself.

Also; I can do without your demeaning attitude. I wasn't born yesterday and I'm not some punk kid. There's always one that has to jump in and add his negativety.
 
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