If we are talking about a manuel transmission, then what you are describing are bad syncros in the transmission. Syncros are brass rings inside the transmission that hold your gears in the proper selected range. when worn they allow your selected gear to pop out.
Bill, ASE Master Technician.
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my 2006 jeep grand cherokee started overheating at idle and short trips out of the blue. changed the...
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my 2006 jeep grand cherokee started overheating at idle and short trips out of the blue. changed the thermostat...still overheating. what could be the problem?