speedometer box?

Joined
May 5, 2011
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750
Location
Livingston, TN
I need to know what the box is actually called that the speedometer cables hook into under the hood. Its on a 76 and was wondering how common it is for them to wear out.
Thanks
 

surfpig

The Anti-Tech
Joined
Jan 14, 2005
Messages
5,088
Location
Here. Now.
I need to know what the box is actually called that the speedometer cables hook into under the hood. Its on a 76 and was wondering how common it is for them to wear out.
Thanks

It's a "speed marker", it's part of the emissions system...
 
Joined
Jan 27, 2010
Messages
446
Location
Williamsburg, Va
Question... Im in the beginning stages of beginning of wiring a chevy small block with a painless harness. I had no plans of wiring this speed marker box into the new harness. I assumed the process of the cable to the gauge to run the speedometer was mainly mechanical in nature. Im assuming the gauge will still function correctly if there is no juice to the box, but if Im wrong, someone let me know.

I have also seen replacement cables that run straight from the trans to the gauge, bypassing the box. Do these cables ever really wear out?
 

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