Question about 2003 Ford Mustang

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99 ford mustang 3.8 Transmission jumping into lower gear

When letting off the accelerator or barely tapping the brakes the transmission jumps into a lower gear. This does not appear to happen when the car is not in OD. It only started after adding some transmission conditioner to the car.

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You may want to check the fluid level after putting that conditioner in, and also make sure the conditioner wasn't the type that you are only suppose to run for 30miles or so. When checking your auto trans fluid, make sure the vehicle is at an idle, and sitting steady. Take the stick out, wipe it, and check again. If you have too much fluid in it, the trans will jump from the lack of friction, and build up of pressure. I am not sure of your particular model, but you may have a drain plug on the trans. And another note, if your trans is too low, the same thing goes into effect.

Posted on Feb 14, 2009

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Posted on Jan 02, 2017

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