Question about 1993 Chevrolet G30

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Auto trans wont change gears speedometer jumps up and down

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Have you checked the fluid level? if not do so with engine running in park and e brake pulled Also look at the fluid is it brown in color and smell sort of like onions? if it does it needs a filter and oil change. most cars require the filter and oil to be changed every 30,000 miles. Also add Lucas transmission additive so that it will soften the seals and clutches. If you want to do this yourself let me know and I can give you instructions, however it can be messy. the transmission will take 12 quarts of fluid dexron III and the lucas oil conditioner. Write back if you need more help and thanks for using fix ya.

Posted on Sep 07, 2010


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Spedomoeter jumps up and down works fine sometimes especially in the morning all other gauges work

The speedometer Gear drive may be going bad. Or it could be if your speedometer is cable driven the cable just needs lubed. On the side of your transmission near the rear you will see a small gear box with wires or a cable. Place a pan under it and remove it from trans. Check gear to see if it is chewed or worn. If not and you have a cable driven speedometer use graphite cable lube on cable. If this don't work it could be in the cruise control or speedometer.

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'93 corolla,4 trans.speedometer reads10 mph slow and the transmission shifts real fast.Its in third gear bythe time u hit 30 mph. Also wont downshift at this point either.

well what you want to do is change the trans control solenoid or the trans modulator.i know this car has a trans modulator but im not sure that it has a trans solenoid.either way it's a lot cheaper than changing the trans.hope this info helps. take care and good luck, manny

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Speedometer sensor/cable needs replacing

try looking at the book theres a cable from the transmit ion to the speedometer and it could be a bad connection or theres a gear in you're trans that spins and tells how fast you're going sometime those go out haven't had that problem yet but i built my truck from the ground up

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