Question about 1997 GMC Yukon
Speedo quits working and it won't shift out of first gear. When the speedo starts to work, then it shifts gears again
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Posted on Jan 02, 2017
SOURCE: speedo quit working-- trans
your fluid is low and quite possible you seized your tranny up apply fluid and dont just rely on dipstick for this make sure the tranny is full of fluid
your linkage to transmission might have come apart another reason for no shifting
now for the speedo
there is a little device that connects speedo cable to the tranny and then the mechanical of tranny from there is called a speedo bullet
if you seized your tranny the speedo bullet would have gotten sheared off in side the speedo bullet is wrenched on and can be wrenched off replace the bullet speedo should start working again
Posted on May 30, 2008
I will try and clear up any confusion about the different model designations.The trans was first introduced as the Turbo Hydramatic 700 r 4.Later in the evolution of that family,it had improvements made on it by the factory engineers,and they redesignated it the 4L60 model.The 700/4L60 uses a throttle valve cable as a mechanical indication of the throttle position....to the trans.The TV cable regulates mainline hydraulic pressure inside the transmission.This model also uses a governor as a road speed mechanism.It is responsible for the TIMING of the upshifts,and is responsible for the trans being in first (low) gear from a standing start.In 1993,the 4L60E was introduced to the lineup.Same trans as the 700/4L60,but now it is totally electronic,and totally controlled by the PCM (Powertrain Control Module) based on electrical inputs/outputs from the trans,throttle position sensor,road speed,etc.The engineers took the 700/4L60 and did away with the governor and TV cable,made it totally electronic.Early 700's had a mechanically driven speedometer,while the later 4L60's and E's had an electronic speedometer.1993 was a transition year.I have seen both,the 4L60 and the 4L60E in 1993 model trucks,it depends on the month of the manufacture of the vehicle.Your truck could have either,or.The way to visually identify the difference is........on the driver side,the 700/4L60 trans case will have a round,black,governor cover,about 3 or 4 inches in diameter.The 4L60E case does not.The 700/4L60 also has the TV cable mounted on the passenger side of the trans case,and it routes up to the throttle body/gas pedal/accelerator linkage.The 4L60E does not.Recently,the 4L65E and 4L70E versions have been put into production.Based on your description of the malfunction symptoms,i would be inclined to say yours is probably the 4L60E version,because the speedometer malfunction occuring at exactly the same time as the shift malfunction.On a 700/4L60,the speedo malfunction would have no affect on the upshifts,the trans would operate normally.On the 4L60E,a speedo malfunction would likely cause no upshifts.You should still visually verify by the governor cover,or lack thereof,on the side of the trans case.It could just be a speed sensor malfunction if it has the "E" model.If so,it would have set a trouble code which can be accessed with a scan tool or a code reader.Hope this eliminates any confusion.Good luck!!
Posted on Nov 28, 2008
Your Trans should be the 4L60. If your speedometer quits working and the truck won't shift out of 1st gear, the "Speed Sensor" is probably bad or the wiring is bad where it plugs into the sensor. The sensor will be towards the back of the trans or on the tail shaft. An easy way to test if the wiring is bad at the plug is to pull on the wire 3" or 4" from the plug and watch closely to see if it stretches. If there is any stretch the wire inside the plastic sheath is broken.
Posted on Jan 16, 2009
This trans is computer controled if your gages quit working as well I would start checking fuses and relays. If this doesn't provide a solution let me know and I will get my manual out and go a little deeper.
Posted on May 01, 2009
SOURCE: I have a 1995 gmc
You may have a bad Vehicle Speed Sensor [VSS] This sensor provides the information the speedometer needs to indicate speed and also supplies the transmission with information it needs to determine when to shift. If the signal is lost you can end up with the very symptoms you are having. It's usually located on the rear of the transmission or transfer case area. Hope this helps!
Posted on Nov 27, 2010
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