Having problems with your 1993 GMC Sierra K1500 ?
Speedo stopped working last night. Stuck in first!
\015 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!\015
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.
Repair Help & Product Troubleshooting for 1993 GMC Sierra K1500
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