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Speedometer wheel drive

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Old Mar 16, 2025 | 07:04 AM
  #1  
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Speedometer wheel drive

Hi everyone,

Since I bought my Dymanic 88 the Speedometer does not work. Recently I changed the front shocks and when on the drivers side decided to investigate why. On removing the grease cap there is a square drive inserted in there but whatever joins it to the cable through the axle shaft is missing. What exactly am I missing here? I presume another sort of long square drive or insert that joins the both, I am open to any answers here. Thanks.
Old Mar 16, 2025 | 10:05 AM
  #2  
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The 1965-70 Olds full size cars used a plastic socket inside the dust cap to drive the speedo cable. These are not reproduced and N.O.S. or good used ones are nearly nonexistent. Unfortunately the get broken when ham-fisted "mechanics" don't know what they are doing.





Old Mar 17, 2025 | 08:24 AM
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Charlie Jones's Avatar
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And I might add, make sure the speedo cable isn't binding.
It's a good idea to remove the cable from the casing and clean and lube it with Vaseline
A binding cable can cause that 60 year old plastic to snap easily..
Old Mar 17, 2025 | 10:27 AM
  #4  
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I have this setup in my 64 Ninety Eight as well. The cable AND the little nylon tube were broken. I replaced the cable, and I JB Welded the little white tube into the cap. I will be on the lookout for more of these NOS caps at future swap meets!
Old Mar 17, 2025 | 03:45 PM
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NOS is:

https://oldsobsolete.com/products-pa...035/#gsc.tab=0


For this application I use graphite spray available on Amazon.


Last edited by Tri-Carb; Mar 17, 2025 at 03:52 PM.
Old Mar 17, 2025 | 06:43 PM
  #6  
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Originally Posted by Tri-Carb
You'll note that ad is where I stole the photo that I posted above.
Old Mar 17, 2025 | 07:25 PM
  #7  
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I would think with some creative ingenuity one could fabricate a drive that can connect to the cable.
Old Mar 17, 2025 | 07:28 PM
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Originally Posted by oldcutlass
I would think with some creative ingenuity one could fabricate a drive that can connect to the cable.
True, but personally that seems like something that could be easily 3D printed today.
Old Mar 17, 2025 | 07:29 PM
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I was talking about this post to my 14 year old son. He suggested that he could likely make the cap insert with his 3d printer.
Old Mar 17, 2025 | 07:32 PM
  #10  
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Originally Posted by Tyroma
I was talking about this post to my 14 year old son. He suggested that he could likely make the cap insert with his 3d printer.
So you're saying I think like a teenager...
Old Mar 17, 2025 | 07:34 PM
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Originally Posted by joe_padavano
So you're saying I think like a teenager...
haha!!! I actually post that post THE SECOND before you posted!! Great minds think alike
Old Mar 18, 2025 | 05:52 AM
  #12  
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Originally Posted by Thebaron
Hi everyone,

Since I bought my Dymanic 88 the Speedometer does not work. Recently I changed the front shocks and when on the drivers side decided to investigate why. On removing the grease cap there is a square drive inserted in there but whatever joins it to the cable through the axle shaft is missing. What exactly am I missing here? I presume another sort of long square drive or insert that joins the both, I am open to any answers here. Thanks.
Hey Baron! Let me know if you can't find the cap that you're looking for. As my Olds uses this setup, I have a template to try to build one with a standard cap and my boy's 3D printer. He likes a challenge.

Ty
Old Mar 18, 2025 | 07:31 AM
  #13  
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Originally Posted by joe_padavano
The 1965-70 Olds full size cars used a plastic socket inside the dust cap to drive the speedo cable.
A small correction Joe.
That should read 1963-70 Olds full size cars....
The part number changed somewhere in there, but they all fit the same.
Old Mar 19, 2025 | 06:04 AM
  #14  
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Originally Posted by Charlie Jones
A small correction Joe.
That should read 1963-70 Olds full size cars....
The part number changed somewhere in there, but they all fit the same.
Yeah, I was lazy, as I didn't want to get into the Jetstar 88 exceptions. The 64 J88 drove the speedo from the trans, and while the 65-66 J88s used the wheel-driven speedo, the caps for those are unique to the J88 because they used the smaller A-body front wheel bearings and hubs.
Old Mar 19, 2025 | 09:47 AM
  #15  
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Originally Posted by Thebaron
Hi everyone,

Since I bought my Dymanic 88 the Speedometer does not work. Recently I changed the front shocks and when on the drivers side decided to investigate why. On removing the grease cap there is a square drive inserted in there but whatever joins it to the cable through the axle shaft is missing. What exactly am I missing here? I presume another sort of long square drive or insert that joins the both, I am open to any answers here. Thanks.
https://classicoldsmobile.com/forums...8-98-a-178196/

One just popped up for sale!
Old Mar 19, 2025 | 12:27 PM
  #16  
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Does the cable go through the spindle or something equally wild?
Old Mar 19, 2025 | 12:30 PM
  #17  
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Originally Posted by Koda
Does the cable go through the spindle or something equally wild?
Yes! Right through the center!
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