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Re: auto trans won't go into gears
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.
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Try to check the trans mission gears of your 1995 jeep grand cherokee.The shift fork and the clutch sleeve of the trans mission is locking to the other gears .And then also check the starter motor and its solenoid.if the starter motor solenoid is destroyed or worn out replace .
it can be the shift solenoid in the trans there is one for 1st and 2nd then there is one for 3rd and fourth easy to change drop pan they are right there.about 40 to 60 at dealer for solenoid and of course fluid and filter about 60.00
I will bet it grinds when you try to engage first or reverse. When this happened on my car, I adjusted the clutch and it improved. You need about a half inch of free play when you first touch the pedal with your foot. If you have a slave cylinder, (hydraulic clutch). You may need to bleed the system. With air in the system, you can't get enough clutch to fully disengage the trans from the motor.(Clutch and pressure plate) It's like you only pushed down half way on the pedal. If it's not hydraulic, it should be adjusted with wrenches. If clutch is fine, It could be a loose shift linkage. It would seem extra sloppy when moving shifter, It would just not go in gear, with out the grinding.Hope this helps. lbreen
You are likely correct...sounds like the synchro is shot or the shift fork is somewhat worn. Is fluid full? As long as the clutch does not slip and is engaging and disengaging somewhere in the center to just below center of travel, it's OK.
Is it manual or auto trans? If manual the gear lube is thicker when cold and the syncronizers tend to stick and not slide free for grind free shifting or for locking into gear.
If Auto trans if the jeep is warmed up setting then cycle the gears before driving. If that helps then the fluid is not getting through the valve body properly. It could be metal in the body or filter or cold seals are letting fluid by til the seals warm, expand and hold pressure. I'm assuming trans fluid is good, not old. One item that can lead to poor cold shift in an auto trans is a bad torque convertor. Since it seems to be a second gear issue the second section of the trans could have a bad seal. In an auto trans I'd take to a shop and have a cold pressure test done. They will tell which one is the problem.
Many times this is caused by either a sticking electronic shift solenoid in the transmission or the trans fluid and filter need to be replaced, has the trans been serviced, it should have been done at 60,000 miles.