speedometer cable - cruise control

A

alan bredbury

New member
Aug 5, 1999
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As we returned from our last trip the speedometer started
reading lower than it should. The speedo now shows between
0 and 30 mph at highway speeds. I figure that is a bad
cable so I start taking things apart. Both cables seem to
be in fair shape, the short one from the tranny to the
cruise control transducer? (I don't know if that is the
right name) and the long one from the cruise control thingy
to the speedometer both turn freely and have square ends
still attached. When I stick the short cable in the Cruise
control I can not turn it and upon further inspection the
square end opf the short cable seems to be somewhat rounded
at the tip. I am assuming that the cruise control
transducer has seized up and the short cable is slipping. I
thought about trying to attach the long speedometer cable
directly into the tranny but it looks like the cruise
control changes the rotation and with headers I don't think
the cable will reach. Has anyone had this problem? My
inclination is to disassemble the cruise control thingy and
try to free it up. This will probably result in a (worse)
broken cruise control thingy.

=====
Alan Bredbury
Clinton, Ct.
1974 GMC 26' Classic Motorhome
http://www.finesttool.com/index.html/special.htm

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It would prob. not help to open up the cruse contro transducer. Inside
there is a small bearing on the shaft that wears out and allows the
internal wheels to touch and some times jam. It is possible to get these
rebuilt and I have a link on my web page, however I would suggest going to
the Rostra (pictures on my web page) and using an electronic cruse
control. I think you will save time and money in the long run. Also the
original transducer does not have a long life even after rebuilding it.

gene

>As we returned from our last trip the speedometer started
>reading lower than it should. The speedo now shows between
>0 and 30 mph at highway speeds. I figure that is a bad
>cable so I start taking things apart. Both cables seem to
>be in fair shape, the short one from the tranny to the
>cruise control transducer? (I don't know if that is the
>right name) and the long one from the cruise control thingy
>to the speedometer both turn freely and have square ends
>still attached. When I stick the short cable in the Cruise
>control I can not turn it and upon further inspection the
>square end opf the short cable seems to be somewhat rounded
>at the tip. I am assuming that the cruise control
>transducer has seized up and the short cable is slipping. I
>thought about trying to attach the long speedometer cable
>directly into the tranny but it looks like the cruise
>control changes the rotation and with headers I don't think
>the cable will reach. Has anyone had this problem? My
>inclination is to disassemble the cruise control thingy and
>try to free it up. This will probably result in a (worse)
>broken cruise control thingy.
>
>=====
>Alan Bredbury
>Clinton, Ct.
>1974 GMC 26' Classic Motorhome
>http://www.finesttool.com/index.html/special.htm
>
>__________________________________________________
>Do You Yahoo!?
>Send instant messages & get email alerts with Yahoo! Messenger.
>http://im.yahoo.com/
>
Genef -- 77PB/ore/ca
GMC MOTORHOME INFORMATION
mr.erf
http://www.california.com/~eagle/
 
> I
>thought about trying to attach the long speedometer cable
>directly into the tranny but it looks like the cruise
>control changes the rotation and with headers I don't think
>the cable will reach. Has anyone had this problem? My
>inclination is to disassemble the cruise control thingy and
>try to free it up. This will probably result in a (worse)
>broken cruise control thingy.
>
>=====
>Alan Bredbury

Alan - the long cable should reach the tranny even with headers if
you unattach it from the front step bracket. The cruise transducer
doesn't change direction. I repaired my cruise control three times
over the years and it recently went bad again and striped out the
plastic speedometer gear. I've now given up on it and I posted a
week or so ago that I had just ordered the Rostra electronic control
for Duane Simmons. Since it doesn't use vacuum to acuate the
throttle, it is a much better control and gives more precise settings.

Emery Stora
77 Kingsley
Santa Fe, NM
 
I have no intention of trying to resurect the stock cruise
control. I just want to get the speedometer working in a
week or so, minimal cost. Thanks for the info though.

>It would prob. not help to open up the cruse control
>transducer. Inside there is a small bearing on the shaft
>that wears out and allows the internal wheels to touch and
>some times jam. It is possible to get these rebuilt and I
>have a link on my web page, however I would suggest going
>to the Rostra (pictures on my web page) and using an
>electronic cruse control. I think you will save time and
>money in the long run. Also the original transducer does
>not have a long life even after rebuilding it.

gene

=====
Alan Bredbury
Clinton, Ct.
1974 GMC 26' Classic Motorhome
http://www.finesttool.com/index.html/special.htm

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Send instant messages & get email alerts with Yahoo! Messenger.
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then you can run the cable directly to the transmission and eliminate the
cruse transducer. But like you say, watch that it does not get too close
to the header.

gene

>I have no intention of trying to resurect the stock cruise
>control. I just want to get the speedometer working in a
>week or so, minimal cost. Thanks for the info though.
>
>>It would prob. not help to open up the cruse control
>>transducer. Inside there is a small bearing on the shaft
>>that wears out and allows the internal wheels to touch and
>>some times jam. It is possible to get these rebuilt and I
>>have a link on my web page, however I would suggest going
>>to the Rostra (pictures on my web page) and using an
>>electronic cruse control. I think you will save time and
>>money in the long run. Also the original transducer does
>>not have a long life even after rebuilding it.
>
>gene
>
>
>
>=====
>Alan Bredbury
>Clinton, Ct.
>1974 GMC 26' Classic Motorhome
>http://www.finesttool.com/index.html/special.htm
>
>__________________________________________________
>Do You Yahoo!?
>Send instant messages & get email alerts with Yahoo! Messenger.
>http://im.yahoo.com/
>
Genef -- 77PB/ore/ca
GMC MOTORHOME INFORMATION
mr.erf
http://www.california.com/~eagle/
 
I took the transducer apart, wow I am glad I did not care
about saving it as a working unit (lots of little pieces
and it was shot anyway). The gears were not meshing any
longer due to wear and bushing positions in the case. I was
able to tighten things up and move the bushings in the
case. It now works fine for driving the speedometer. It
will never function as a cruise control component again.
Thanks for the help.

>then you can run the cable directly to the transmission
>and eliminate the cruise transducer. But like you say,
>watch that it does not get too close to the header.

>gene

>>I have no intention of trying to resurect the stock
cruise
>>control. I just want to get the speedometer working in a
>>week or so, minimal cost. Thanks for the info though.

>>>It would prob. not help to open up the cruse control
>>>transducer. Inside there is a small bearing on the
shaft
>>>that wears out and allows the internal wheels to touch
and
>>>some times jam. It is possible to get these rebuilt and
I
>>>have a link on my web page, however I would suggest
going
>>>to the Rostra (pictures on my web page) and using an
>>>electronic cruse control. I think you will save time and
>>>money in the long run. Also the original transducer
does
>>>not have a long life even after rebuilding it.
>
>gene

=====
Alan Bredbury
Clinton, Ct.
1974 GMC 26' Classic Motorhome
http://www.finesttool.com/index.html/special.htm

__________________________________________________
Do You Yahoo!?
Send instant messages & get email alerts with Yahoo! Messenger.
http://im.yahoo.com/
 
> Also the
> original transducer does not have a long life even after rebuilding it.
>
> ==================================

Mine must be the exception. It was rebuilt 125K miles ago & still works
perfectly.

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>I took the transducer apart, wow I am glad I did not care
>about saving it as a working unit (lots of little pieces
>and it was shot anyway). The gears were not meshing any
>longer due to wear and bushing positions in the case. I was
>able to tighten things up and move the bushings in the
>case. It now works fine for driving the speedometer. It
>will never function as a cruise control component again.
>Thanks for the help.

Alan - you might not want to operate it very long this way because if
it freezes up again it might take out the plastic speedometer drive
or else the transmission governor plastic drive gear when it siezes.

Emery Stora
77 Kingsley
Santa Fe, NM
 
yup yup

If you buy the Rostra electronic version, you can put in the pulser for
now and do the complete install later.

gene

>>I took the transducer apart, wow I am glad I did not care
>>about saving it as a working unit (lots of little pieces
>>and it was shot anyway). The gears were not meshing any
>>longer due to wear and bushing positions in the case. I was
>>able to tighten things up and move the bushings in the
>>case. It now works fine for driving the speedometer. It
>>will never function as a cruise control component again.
>>Thanks for the help.
>
>Alan - you might not want to operate it very long this way because if
>it freezes up again it might take out the plastic speedometer drive
>or else the transmission governor plastic drive gear when it siezes.
>
>Emery Stora
>77 Kingsley
>Santa Fe, NM
>
Genef -- 77PB/ore/ca
GMC MOTORHOME INFORMATION
mr.erf
http://www.california.com/~eagle/
 
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