Question about 1993 GMC Sierra K1500

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Speedo stopped working last night. Stuck in first!

My question has 2 parts. Is my truck equipped with a 700r4 or a 4l60? And second will the speedo not working cause it to not shift? Truck has a tranny that has about 1800 miles since rebuild. Was working fine till the speedo stopped working!

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  • James Tepfenhart
    James Tepfenhart May 11, 2010

    You were kinda broken up there, so I'm not totaly sure of what you were asking, but what I got out of it was your speedomiter stopped working after your transmission stopped working. Thats because on some vehicles they are connected. not all speed sensors are on the wheals. some are on the transmission.

  • tim simpson
    tim simpson Jan 13, 2014

    the speedo stopped and the trans wont shift out of first. would hooking up a cd player have anything to do with the sensors on the transmission?

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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

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