Question about 1994 Chevrolet K1500

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Transmission will not shift

I Installed a 1995 4l80e transmission into a 1994 chevy k1500 with a 6.5 diesel.I have reverse and a forward gear,but will not shift into higher gears. Do i have to change anything else in the transmission besides the shift shaft? I changed the shift shaft because my park neutral safety switch is in the steering colunm instead of on the side of the transmission.

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  • Chevrolet Master
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Check the Vehicle Velocity Sensor (V V S)-(Speed Sensor) or the wire harness to the VVS. IF the ECM is not getting a signal from the V V S, the PCM can not give the signal to switch gears. The V V S is on the drivers side of the end ot the transmission that is held on by one bolt. Best thing to do is to have the truck scanned at Auto Zone for a DTC code and to confirm that the V V S has gone bad and they can give you the step by step instruction to replacing the sensor and takes about 15 min to do. Good luck and keep me posted. Keep an eye on the transmission fluid, make sure you don't run the transmission to hard and burn it out over a $40.00 sensor which is better then $1,800 for a transmission replacement. 

Posted on Jun 22, 2009

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