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Old 08-14-2010, 08:28 AM
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speedo juumps around

i got my trk down home finly and my speedo jumps around all the time, my guess is the speed sensor on the rear diff., and i ink that is causing my cruise not to work due to a broken speed singnal
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Old 08-14-2010, 10:03 AM
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Could be one or more of several things. The simplest is to swap the speed sensor in the rear diff, it's about $25 and takes all of 30 seconds to swap. It could also be a wire, the PSOM or the exciter ring in the diff.

I was working on this exact issue on a friend's 96 not too long ago. Turned out to be a chunk off of the ring gear that chipped the pinion and mangled the exciter.

If you end up needing to test the PSOM (Programmable Speedometer/Odometer) and are decent with electronics, I can help you in setting up a cheep test bench.
http://anscv.com/images/Truck/96%20350/P1020052.MOV
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Old 08-14-2010, 04:54 PM
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Definitely check that speed sensor first...that causes a lot of issues including jumpy speedo, brake light staying on, cruise not working, etc. It's easy and cheap enough to try first. Good luck!
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Old 08-14-2010, 10:22 PM
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yeah i going to get a sensor i pulled it and cleaned it off and the diff has 167k on it and has had norn. service so it probly just a sensor
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Old 08-16-2010, 07:23 AM
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If its not the VSS in the rear end its most likely the PSOM (speedometer). You can either get yours rebuilt or buy another cluster from a junkyard. But since the PSOM stores mileage, whatever miles the donor rig had will show on your rig if you go with a used part.
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Old 08-16-2010, 06:35 PM
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Quote:
Originally Posted by superduty4x4 View Post
If its not the VSS in the rear end its most likely the PSOM (speedometer). You can either get yours rebuilt or buy another cluster from a junkyard. But since the PSOM stores mileage, whatever miles the donor rig had will show on your rig if you go with a used part.
cool thanks i never figured on the ax. speedo but hey if im lucky its just the sen.
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