cj7 speedometer cable - Page 2 - JeepForum.com
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post #16 of 18 Old 07-11-2013, 09:54 PM
1977 CJ7 
Join Date: Mar 2013
Location: Yuma
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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post #17 of 18 Old 07-12-2013, 08:56 AM
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1984 CJ7 
Join Date: Mar 2013
Location: Arlington
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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post #18 of 18 Old 08-18-2015, 05:40 PM
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Join Date: Aug 2015
Location: Hillsdale
Posts: 2
Cj Broken tip of cable stuck in Speedometer

I know this is an old post but I just went through a speedometer issue on my 85 CJ7 and I want to share. When I bought the truck the speedometer never worked. I finally got around to looking at it and found the whole cable missing. This should be easy I thought ..... well ... got a new cable crawled underneath hooked it up to the transfer case ....halfway to beer....fed it through the firewall... attempted to screw it into the speedo... and it seemed long ... couldn't get the square end into the speedometer. I messed with it for awhile and then finally said the heck with this... Down goes the windshield, off comes the dashpad, and off come the dash panel ( I love this Jeep) I try to get the cable in again ...no luck ... I figure I'll pull out the speedometer and see what is going on ... I get it out, and see there really is no hole for anything to go into... so I remove the two flat head screws and disassemble the whole thing. I'm thinking that maybe something is stuck in there so I take it to the front of the Jeep and GENTLY begin tapping the threaded end on the bumper ... it looks like something moved!! tap tap tap ...yep ....tap tap tap ....here it comes ....tap tap tap .... a broken PLASTIC end was stuck in there ... did all the again, in reverse, and presto....I'm drinking a beer.
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