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Unread 06-26-2013, 06:43 AM   #1
LeePrather
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1978 CJ5 
 
Join Date: Mar 2013
Location: Jefferson, Ga
Posts: 626
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?

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Unread 06-26-2013, 07:19 AM   #2
walkerhoundvm
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1981 CJ8 
 
Join Date: Apr 2010
Location: The Little Apple, KS
Posts: 3,090
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 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."
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Unread 06-26-2013, 08:26 AM   #3
LeePrather
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1978 CJ5 
 
Join Date: Mar 2013
Location: Jefferson, Ga
Posts: 626
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
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Unread 06-26-2013, 08:37 AM   #4
texasdave
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1980 CJ7 
 
Join Date: Dec 2007
Location: Killeen, Texas
Posts: 1,015
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.
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Unread 06-26-2013, 10:36 AM   #5
LeePrather
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1978 CJ5 
 
Join Date: Mar 2013
Location: Jefferson, Ga
Posts: 626
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
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Unread 06-26-2013, 11:24 AM   #6
LumpyGrits
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1985 CJ7 
 
Join Date: Jul 2010
Location: The Mojave Desert Palmdale Ca. U.S.A.
Posts: 5,181
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
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Unread 06-26-2013, 11:53 AM   #7
LeePrather
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1978 CJ5 
 
Join Date: Mar 2013
Location: Jefferson, Ga
Posts: 626
Had a friend of mine say check the reducer...the piece between the t case and cable...gears wear down inside
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Unread 06-26-2013, 12:53 PM   #8
foggybottombob
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1984 CJ7 
 
Join Date: May 2008
Location: Monument Colorado
Posts: 5,833
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.
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Unread 06-26-2013, 01:44 PM   #9
walkerhoundvm
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1981 CJ8 
 
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Location: The Little Apple, KS
Posts: 3,090
^^excellent way to rule it out, fbb^^
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