1972 TH400 speedo gear housing sensor wire

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Blklimo

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This wire is for?

Pic attached
 

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Any other evidence of a cruise control system?
 
No cruise control, talking to classic transmission it is a 1972 only thing but what does it do?
 
I am a little puzzled, they tell you it is a 72 only but they dont know what it does?
You found the wire just hanging not connected to any wire harness?
______________________________
 
It does plug in but I don't have the car here right now...
I'll chase it next time i'm under the car

Thanks for your help
 
Please let us know what it connects to. Could not find any reference to it but did find the picture on the Frank's Pontiac Parts web site.
 
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I just purchased a 72 Grand Prix 455/TH400.
It also has the connector on the mechanical speedometer gear housing.
The wires join up with the kick-down wire and continue up behind the engine. No sign of cruise. Any idea what it does?
 
I’m curious as well. My friend has a 72 Grand Prix Model J 400 and has this style. I have never seen this before. He is trying to reseal this drive. Are the seals the same as the conventional style?
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Finally found the answer SCS , speed control switch related to emissions.
www.gtoforum.com

Speedometer driven gear housing

(72 Pontiac lemans; th 350) Switching speedometer driven gear housing to change driven gear. A wire leads into the housing and connects to it via rubber connector. My shop manual says this is the speed control switch, referred to in my shop manual as the SCS. However, new housing Iam installing...
www.gtoforum.com www.gtoforum.com
 
I have seen that , for emissions the tcs solenoid uses speedo reference along with temp sensor to allow full vacuum to vacuum advance on the spark whirler.
 
G-577197 said:
I’m curious as well. My friend has a 72 Grand Prix Model J 400 and has this style. I have never seen this before. He is trying to reseal this drive. Are the seals the same as the conventional style?
Click to expand...
HI i am also looking to reseal or replace as mine is leaking. I had the transmission rebuilt but the shop said they had never seen one like it. I haven't been able to find one. have you ?
 
G-577197 said:
I’m curious as well. My friend has a 72 Grand Prix Model J 400 and has this style. I have never seen this before. He is trying to reseal this drive. Are the seals the same as the conventional style?
Click to expand...
HI I need to do the same . How did your friend make out?
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Rwagner said:
HI i am also looking to reseal or replace as mine is leaking. I had the transmission rebuilt but the shop said they had never seen one like it. I haven't been able to find one. have you ?
Click to expand...
Why does it have to be replaced?
 
What was your point in copying a previous post with no further comment?
 
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