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Unread Yesterday, 05:13 PM   #1
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Zyurazek's Avatar
1995 YJ Wrangler 
Join Date: Dec 2013
Location: Spotsylvania, Virginia
Posts: 99
Speedometer issue

So I'm having new speedometer issues. When I am going 70-80 mph, my speedometer thinks I'm going around 4mph. Then the shift light thinks I need to shift although I'm out of gears to move up to. Speedometer issue or computer? Also, a week before this started, I changed my clutch. Could a short do this? The odometer moves steadily.

95 YJ
5 speed 4.0L

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Unread Today, 01:15 AM   #2
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1992 YJ Wrangler 
Join Date: Jan 2014
Location: Victoria, BC
Posts: 64
The shift light will always come on in the 1700 range in my 92, even 5th. I don't think that's related unless it's on the entire time. But I'm almost positive it runs solely of the rpm.
It sounds like your speed sensor might be pooched. It's the electronic sensor at the back of the Tcase. Take it out with a 13mm wrench and inspect the teeth on the gear. Then hook it up the speed sensor to a drill and see if it's reading speed when you turn the drill.

Last edited by ThreeToe; Today at 01:16 AM.. Reason: Spelling mistake
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Unread Today, 01:18 AM   #3
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1992 YJ Wrangler 
Join Date: Jan 2014
Location: Victoria, BC
Posts: 64
Also take a mental note of the direction the speed sensor is clocked and reinstall it the same way. It can be installed 4 different ways based on the tooth count of the gear and won't work in 3 of the four positions.
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Unread Today, 05:50 PM   #4
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1993 YJ Wrangler 
Join Date: Jun 2014
Location: fowler, ohio
Posts: 13
I'm not sure about the shift light being rpm dependent based on it coming on for me at different rpms in different gears.

As far as the speedo
check the speedometer gear, 2 bolts on the back of the transfer case with wires coming out, and inspect the gear for wear
the gear could be torn up or just barely making contact.

also check the motherboard behind the cluster for the speedo, it can be corroded and give false readings, just wipe the grime off
with rubbing alcohol, BUT DO NOT SCRATCH IT to get grime off or your speedo will not work at all
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Unread Today, 06:16 PM   #5
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1991 YJ Wrangler 
Join Date: Jul 2013
Location: Morrisville, VT
Posts: 449
Engine load sensitive (vacuum) is how the shift light works I believe
How many old threads actually convince *you* to read all 36 pages? http://www.jeepforum.com/forum/f12/length-envy-build-thread-629700/
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