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Unread 07-11-2013, 08:54 PM   #16
1977 CJ7 
Join Date: Mar 2013
Location: Yuma, Az
Posts: 5
I'll be looking to diagnose a speedo problem as soon as I get home in Sept. For some reason I'll be running down the road and look down to see it reading 25mph when I know I'm doing at least 40. Then sometimes it won't register at all. Still other times, it'll be registering what I feel is accurate and then just drop down 20+mph. I figure it's one of three things, the speedo, the cable or the gear in the transfer case. The cable being the cheapest and easiest to replace, I figure I'll replace it first to see if it fixes the problem. If not, I'll look to the transfer case. When all else has failed, I'll take a look behind the speedo to make sure everything is good there and replace as necessary.

So there's my gameplan, but being about as new as they come to the Jeep world, any input would be greatly appreciated.

Semper Fi

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Unread 07-12-2013, 07:56 AM   #17
Registered User
1984 CJ7 
Join Date: Mar 2013
Location: Arlington, VA
Posts: 62
The replacement cable I got caused the needle to jump pretty bad. I thought maybe one of the bends from the x-fer case must be too severe so I disconnected and spun it with a cordless drill making sure all the bends were gentle, but the needle jump was just as bad. I greased the insert and tried again with no improvement. I ruled out binding due to length of the insert since I had it stretched about as far as it would go without kinking it. I ended up just repairing the factory cable and housing and have a smooth speedo. I never figured out what was causing the replacement cable to grab. Not much help in addressing the problem, but another negative observation on the quality of the replacement cables available.
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