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-   -   Speedometer (http://www.jeepforum.com/forum/f8/speedometer-1541506/)

LeePrather 06-26-2013 05:43 AM

Speedometer
 
Ok so I'm down to just a couple annoying issues before I take this thing for body work and paint. The speedometer isn't fluid in movement. It jerks forward, then it will actually start backwards for a second. I know it isn't accurate. I have replaced the cable. I replaced the gauge. In the transmission I pulled out the gear but the teeth seem fine. I haven't altered the gear ratios. Apparently it is tough to find the parts that drive the speed? Any ideas?

walkerhoundvm 06-26-2013 06:19 AM

I've heard that oftentimes the cable needs some graphite to keep it moving smoothly - but since you've already replaced it and checked just about everything else it could be :dunno: I've read of a few threads on this; heck my speedo does it usually around the time I switch gears and start accelerating...it takes a while to catch up, and as far as I can tell "it's a Jeep thing."

LeePrather 06-26-2013 07:26 AM

I bought it in march and it worked then. It's about 10-15 mph off at all times it seems after havingy wife trail me

texasdave 06-26-2013 07:37 AM

New or used? The gauge itself is probably bad. Search this forum for John Strenk post on gauges and see if it tells you how to rebuild the mechanical portion. Also I was looking for some information the other day and came across s web site that told you how to calculate which speedometer gear you need with different size tires and gear ratios. Sadly I don't remember where.

LeePrather 06-26-2013 09:36 AM

I had the original gauge on when I bought and it worked. At some point in my work it stopped even though I have changed nothing under the car. Changed the cable and the gauge and still the same thing

LumpyGrits 06-26-2013 10:24 AM

Bad drive gear in the t'case is what I would ck next.
If your run'n O/S tires that alone could be the error.
You can by different d'gears to correct this.
LG

LeePrather 06-26-2013 10:53 AM

Had a friend of mine say check the reducer...the piece between the t case and cable...gears wear down inside

foggybottombob 06-26-2013 11:53 AM

Take a drill and connect it to the cable then run that for a few seconds. If it still jumps around you know it's not the speedo gears in the t-case. If it does not jump around then you are down to the gears in the tcase or you may have the gear holder indexed wrong.

walkerhoundvm 06-26-2013 12:44 PM

^^excellent way to rule it out, fbb^^


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