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well, there's a doohicky called a TCC solenoid. Basically, when the engine exceeds a certain temperature and the vehicle attains a certain speed, this solenoid engages and locks the lower gears out of the transmission. This feature significantly improves mileage because it makes the transmission lighter. When the vehicle drops back below a certain speed, the solenoid clicks off and drops the lower gears back into the drivetrain.

However, this particular solenoid is located IN the transmission, so it gets sticky after a few years, leading to a situation where the lower gears stay locked and the car makes an unpleasant BAM sound as it tries to shift into lower gears.

The short term solution is to disconnect the solenoid, though this will cost you a little mpg. Any mechanic worth a cent will be able to do this in about 30 seconds and won't charge you for it. Replacement is rather expensive as it involves taking the transmission apart.

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Q: Why does your 1988 Jeep Comanche stall and not start when it runs for a while and gets hot?
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