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Old 02-21-2019, 05:29 PM
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speedometer cable issue - speedo not working

Good Evening.....looking for the best way to pull my speedometer cable out of the back of the speedo. it was making some noise but working, and while doing some other work I asked my mechanic to lube it. It was raining so it was test driven, but on getting it back, the speedo/odometer is not working. I have tried to go under the the dash to disconnect it, but my hands are too big....I can barely get my fingers on it with the harness, vent pipe, etc. in the way. Is there a trick to this I am not seeing? Could the cable just not be pushed far enough in to the speedo? I tried pulling out the cluster a bit, but it appears I would have to drop the column down to get it out. Does that sound reasonable? I'm sure this is child's play for most of you, so please don't judge

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Old 02-21-2019, 05:59 PM
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Speedo

Remember that 6 Y.O. that helped you when you got a smart phone...he'll do it!



Lots of dashes are like that, things stuffed tight in there and of course the last thing you need to connect is the cable. First, ask the guy who worked on it to check and make sure it's tight. If it were me I would just replace the cable because it's so much of a hassle. After the cable is tight or replaced make sure all the other stuff works due to knocking a wire loose. In other words, no easy way to do it.
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Old 02-21-2019, 07:23 PM
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That's actually a good idea....my son would be all over it! My mechanic is about an hour away....sad fact that good mechanics for these old cars are few and far between. These forums and Youtube really are a life saver now and then.
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Old 02-21-2019, 08:37 PM
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First thing I’d do is pull the cable off the tranny and spin the cable by hand to determine where the problem is.
Might not be in the speedo housing.
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Old 02-22-2019, 06:38 AM
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It helps to know the year and model of vehicle you are working on.

My '75 GMC truck has two types of speedometer cables listed in parts catalogs, but only one really works right. The wrong cable has a large threaded fitting on the end, like you should screw it on the back of the speedometer. You can get it to push on, but the threaded fitting is too big to be held tightly by the spring clips. The correct cable just has a flared metal piece on the end, and it pushes into the spring clips on the back of the cluster, which then hold it tightly in place.

My point is that you might have the "almost right" cable, not the correct cable for your vehicle.

Bruce
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Old 02-22-2019, 07:05 AM
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Thanks, Bruce. it is a 68 Camaro. It is hard to know for sure, but I think the cable is original. it screws in to the back of the speedo. I recently swapped the motor and tranny....went from a Saginaw to a Muncie, and that is where the problem started. When I got the car back on the road the speedo made some noise but worked fine....it didn't jump around or anything like that. I had the brake system rebuilt and had the cable lubed at the same time, but when I got the car back the speedo wasn't working---I figured I would wait until the next project to have him fix it, but if I can figure out a way in there I will do it. I just can't get my hand up to the cable from the underside with all the stuff in the way, and can't pull the cluster out because of the column....I could drop the column down (I guess), but not sure that would work either.
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Old 02-22-2019, 09:33 AM
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Buy a new rag joint and loosen your old one, drop the 3 column bolts, a couple screws and the cluster will slide back. You unscrew the thing and your golden to install another cable.

The 3 bolts;
Steve's Camaro - 1967 Camaro Steering Column Realignment

Be glad you don't have a 70 those are a lot more fun.
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Old 02-22-2019, 02:28 PM
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Since the problem started when you installed a different transmission, then I would start by looking at the speedometer gear in the transmission. It's way easier to pull out and inspect, plus it's made of plastic so it might not be meshing correctly or is stripped. A bad speedo cable puts an undo load on the gear, and can wear it down. So, as suggested, try turning the cable from the transmission end and make sure that it turns free. Then, if you have to, tackle the dash side.

Sent from my moto x4 using Tapatalk
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Old 02-23-2019, 08:24 AM
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Sometimes the square drive will break or bend right at the area where the thing screws into the transmission. It is not hard to bend this area which will chew up that plastic gear.
I agree start at the transmission and see if you have a broken drive that is only catching once and a while or if you have a stripped gear. The thing will have around a inch of exposed square at each end if not the piece may be broke.
Once you drop the column, remove the bezel and remove a few face nuts the thing slides forward making the one on the back of the speedometer easy to unscrew.

In 70 they changed it to a clip that you pop up after snaking a screwdriver up through the rats nest of wiring. Your 68 is still a simple setup.
If the transmission side is good a new rag joint and just refreshing the cluster with a good wipe down and new lights is advisable. Once you pop that thing out once it is not that bad to go back if you want to change lights or install a new multigauge.
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