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  #1  
Old 09-01-2003, 11:11 PM
WANT '71 280SEL's Avatar
I'll Go Upside Your Head!
 
Join Date: Jan 2003
Location: Dallas, TX
Posts: 3,378
anyone replaced speedomter cable on '79 SD?

I was working on my reverse switch and pulled my cable all the way out. I couldn't feed it through so I had to cut it off right outside of the transmission. It has about a 1/2" outside of the tranny. I was in a parking lot and it was late so I didn't have any other choice as it seemed then. Does the cluster need to come out or can I just feed the inner part into the cluster? If the cluster does have to come out, how do I get it out?
When I was looking for one here at fastlane it says "without cruise control". Mine has cruise control. Where could I get a cable for mine then?
Thanks
David

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  #2  
Old 09-02-2003, 12:44 AM
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Join Date: Jan 2000
Location: PA
Posts: 5,440
Want,

I replaced my speedo cable , a '80 300SD, a long time ago so memory is fuzzy. I remember I got a kink in the replacement cable and it didn't last long. So make sure you don't get any sharp bends in the new cable. The cable I am talking about is the entire cable, not just the core.

The instrument cluster just slides out, nothing is holding it in but friction. You may have to unscrew the oil pressure line to get the cluster out far enough. Use 2 wrenches so you don't break it off. Don't start car until you replace the oil line.

The speedo cable has a ring that screws onto the speedo head. You may need a pliers to loosen it. Pull the old cable out from the bottom and feed the new one in from the bottom up. Attach it to the speedo head, reconnect the oil line and push the cluster back into the dash.

You might call Phil and ask about any differences in the cables for cruise and non cruise control cars. I thought all the 300SDs had cruise control as standard equipment. I would think they would have the cruise control version cable available.

P E H
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  #3  
Old 09-02-2003, 12:41 PM
Rick Miley's Avatar
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Join Date: Jun 1999
Location: Land O Lakes, FL
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Around 1979 or 1980 they changed the location of the cruise control speed sensor. On the older cars it was on the cable, and on the newer ones they put it on the back of the speedometer. So the question is whether you need the cable with or without the sensor. You'll have to pull the cluster to determine that.
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  #4  
Old 09-02-2003, 01:01 PM
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Join Date: Jan 2000
Location: PA
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Want,

With respect to Rick's comments about where the cruise control pick up is located, my '80 300SD had the pick located on the speedometer. Your '79 may be different.

P E H

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