Rob1325

My speed ometer is jumping all over the place. Is this a easy fix? Do I need a new line to gauge or is there something in tranny that needs to be replaced? My truck is ten years old now and seems many things are starting to go on it.

Thanks,
Rob

Stamey

Your problem sounds like a speedo cable binding up. My problem is I don't know when they switched over to using the VSS for speed information.
If it still has a cable in there, (you can verify by looking at the tail shaft of your tranny, at the back of the transfer case for a cable instead of a sensor), it is fairly easy to fix. Go buy some powered graphite form the auto parts or hardware store. You just have to pull the cable out (it most likely comes out from the back of the gauge). You disconnect the cable housing from the gauge, reach in and pull the cable out of the housing, pour some graphite into the housing, then work the cable back into the housing. You may want to pull the cable and fill the housing with graphite a few times. You can be liberal with the graphite because its a long cable.
When done, push the cable all the way back in and rotate it a little, until it engages the tranny gear and will not turn any more. Then you can reconnect it to the gauge and reassemble. It should not reconnect to the gauge completely if it is not fully inserted into the tranny, so use that as a clue.
Take it for a test drive.

If you have a VSS, there are 3 things, the VSS itself, the gauge has gone bad, or the wiring between the gauge and the VSS (as this also includes the body computer, it is the least likely culprit). I'd start by replacing the VSS as it is cheaper and easier to get than the gauge. It is in the top of the rear end, above the ring gear.

Chris

crobtex

Mine done the same thing when the speed sensor on the rear axel went out. There are several threads on the problem.

CR

Rob1325

Thanks guys,

Will try it out.