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Metal parts found in 4r70w

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New User

Jun 27, 2022, 11:17 AM

Post #1 of 3 (110 views)
Metal parts found in 4r70w Sign In


Hello all I have a ford mustang that was driving without an issue. I changed the transmission fluid at 60K mile without any issues. I recently decided to flush it again at 110,000 as normal maintenance. At this time I found thin metal pieces in the pan but the transmission still had no issues. I decided to remove the unit and do a rebuild as I didn't want to break down. I have disassembled the entire unit and inspected all components with a fine tooth comb. I am not able to identify were these pieces came from and Im worried I will rebuild the unit and have the same problem down the road, since I can't located it. Can someone take a look and try to help me identify the culprit. These pieces are supper thin and are about an 1/8 inch in size. Could this be coming from the torque converter as that is the only unit I can not inspect? Any help is greatly appreciated. If there is any addition information needed please let me know.

(This post was edited by 4r70w on Jun 27, 2022, 11:20 AM)

Hammer Time
Ultimate Carjunky / Moderator
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Jun 27, 2022, 1:58 PM

Post #2 of 3 (92 views)
Re: Metal parts found in 4r70w Sign In

We have a trans expert that will be along eventually. His name is Gary (Gsferraro). He is the right guy to answer this.


We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.


Jun 27, 2022, 5:32 PM

Post #3 of 3 (82 views)
Re: Metal parts found in 4r70w Sign In

Check the sprags, there are 2 of them, one in the reverse drum and one in the planetary, the one in the drum goes bad often, if all looks ok probably coming from converter. Gary

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