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post #1 of 9 (permalink) Old 05-01-2005, 01:58 PM Thread Starter
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Help Diagnosing 4R70W Noise

Hey all,

I have a 2001 Mustang GT with a 4R70W automatic. I purchased the car used with about 15K miles on it. I have since put another 40K miles on it. I am not sure how well the previous owner took car of it but, I have babied it the 3 years I have had it.

I have noticed a sound for some time that sounds sort of like a dragging brake. It is a faint but, audible metal rubbing sound. I recently tracked it down though to the transmission. I had the car up on ramps in the garage and the sound is very noticible through the driveshaft and with a stethascope you can hear it in the tranny. You can also hear it inside the car at certain times while driving.

I have not noticed any problems with the performance of the tranny. It shifts when it should and shifts smoothly and quickly. This is part of what is so puzzling.

The car is pretty much stock. I had the transmission flushed by the dealer at about 30K and have done a partial change including a filter change since. I have always used Motorcraft Mercon V in it. It doesn't see any track time and is my daily driver. Again I don't know how it was treated by the previous owner though.

Any ideas?

Thanks
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post #2 of 9 (permalink) Old 05-01-2005, 02:14 PM
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Probably a bad rear case bearing or something like that.
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post #3 of 9 (permalink) Old 05-01-2005, 04:13 PM Thread Starter
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It doesn't seem to matter whether the car is moving or is in park. I was able to hear the noise while the car was on ramps while the tranny was in P and the car was idling. If it were the rear case bearing I wouldn't expect to hear the noise while in park would I?
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post #4 of 9 (permalink) Old 05-01-2005, 04:49 PM
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and the noise comes from the rear of the tranny?

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post #5 of 9 (permalink) Old 05-11-2005, 03:34 PM Thread Starter
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It is hard to describe but, it seems to resonate through the driveshaft even while in park but, you can hear it if you put a stethascope to the transmission case. Not sure where in the tranny it is coming from but, it sounds the same whether I check the rear or the front of the case. The noise is audible inside the car at certain RPMs, mostly around 1500.
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post #6 of 9 (permalink) Old 05-11-2005, 03:44 PM
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it sounds like your planetary gears are taking a sh!!. either way you'll have to remove the tranny, and disassemle it.
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post #7 of 9 (permalink) Old 05-11-2005, 04:02 PM Thread Starter
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Wouldn't you think I would be having drivability issues though? This is what is so puzzling. The tranny shifts perfectly.
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post #8 of 9 (permalink) Old 05-11-2005, 04:25 PM
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Or the converter is coming apart that will make noise any time the engine is running.
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post #9 of 9 (permalink) Old 05-11-2005, 06:08 PM Thread Starter
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Thanks for the help guys, I think this is one where I am going to have to take it into the stealer.... oops I mean dealer to have it diagnosed.

Thanks
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