Question about 1999 Chevrolet K1500

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Transmission shifting hard

I had problems with my ecm (mouse chewed insulation off some wires) not starting the fuel pump, I bypassed ecm using a relay so my fuel pump comes on with the ignition. Now my transmission shifts extremely hard

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Sounds like the mouse chewed more than just your fuel pump wiring. How hard your transmission shifts is controlled by the PCM, controlling the force motor inside the trans. There should be some troublecodes present in the PCM that may help you pinpoint the problem. You can also hook a scanner to your vehicle to see what it is doing.

There could also be internal mechanical or electrical problems with your transmission. A scanner with bi-directional controls can help you determine whether your problem is electrical or mechanical. These transmissions are known to break springs and plastic pistons in the valve body. Also, if your transmission shifts hard in all gears, including shifting into reverse, your sun shell may break. When this happens, you will loose R, 2nd & 4th gears, leaving 1st and 3rd.

As preventive maintenance, installing a shift kit, e.g. SK4L60E from Transgo, and replacing the plastic accumulator pistons with ones made of aluminum may correct your mechanical problems.

Posted on Jul 18, 2008

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