Ford 4R70W Series Transmissions: Fluid & Filter Change

[Invective]

From our favorite Youtube Ford Technician!


https://www.youtube.com/watch?v=ATRwt32FkSY

[Invective]

Here's another Youtube clip from FordTechMakuloco. I found this one most interesting as Mo's Speed Shop changed my tailshaft housing out with the custom unit with forced tailshaft bearing lubrication.


https://www.youtube.com/watch?v=TK18Ne1LU4Y

[88grandmarq]

Here's another Youtube clip from FordTechMakuloco. I found this one most interesting as Mo's Speed Shop changed my tailshaft housing out with the custom unit with forced tailshaft bearing lubrication.


https://www.youtube.com/watch?v=TK18Ne1LU4Y

personally, I have never seen a tailshaft housing fail this way, but my understanding is this type of failure most often happens on trucks and vans and vehicles from the salt belt.

[SteelQualityMan]

personally, I have never seen a tailshaft housing fail this way, but my understanding is this type of failure most often happens on trucks and vans and vehicles from the salt belt.Isn't this failure also caused by exceeding the "critical speed" of the stock steel MM driveshaft?

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[88grandmarq]

Isn't this failure also caused by exceeding the "critical speed" of the stock steel MM driveshaft?

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from my limited experience with it, when the extension housing fails from exceeding critical speed with stock drive shafts, the housing fails catastrophically and breaks into at least 2 or 3 pieces.

[justbob]

personally, I have never seen a tailshaft housing fail this way, but my understanding is this type of failure most often happens on trucks and vans and vehicles from the salt belt.



Yep. I replaced one on my old ‘03 E250. I had never heard of one cracking and was surprised when the local dealer had them in stock as part of fleet contracts with the local utilities. He claimed it is a quite common failure.


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