Question about 1998 Jeep Grand Cherokee

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Auto trans won't go into gears

1998 jeep grnd cherokee2wd tried to shift manuelly went ok 1st to 2n but would not go into drive. Could this be a fluid problem if so what kind of fluid should I use.

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It's highly likely that the shift synchronizer from 2nd to 3rd is worn out. Since most automatic 3 speed transmissions spend most of their time shifting from 2nd to 3rd those synchros are usually the first to go. In most older vehicles I would recommend checking the transmission vacuum modulator, but as far as I know the '98 cherokee does not have one. It is, however, a slim possibility. Check under your vehicle along both sides of the transmission for a small canister with a vacuum line connected to it, or for a vacuum line in general connecting to any part of the transmission near the shift actuator or the tailshaft. If this is present, you have a modulator and it may be bad which will cause delayed shifts, jerky shifting and sometimes no shifting at all into higher gears unless you are at dangerously high engine RPM. If there is no vacuum modulator, you might want to check the wires on the electronic shift control which should be present. Any signs of broken or corroded wires or contacts might be a clue to the problem. If possible, disconnect the wiring harness, inspect it for dirt and/or corrosion and clean it up. Once cleaned reconnect and try again. It is rare for the electronic shift controls to go bad, but it does happen from time to time. Also, does your transmission make a whirring or humming noise when backing up? Especially a noise that gets louder if you go faster in reverse? If so this is a definite sign of serious wear in the transmission and points more strongly to the synchros simply being too worn to allow the vehicle to shift. Let me know what you find out and how it goes.

Posted on Feb 03, 2009

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Linkage may be damaged. Stuck.

Posted on Feb 03, 2009


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