Mechanical Diode
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Fleet Mechanic
Joined: Nov 2000
Posts: 1,713
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From: In my House
Mechanical Diode
What year did they use the mechanincal diode in the auto transmissions? I remember reading somewhere to stay away from certain years, as they were prone to failure. It may have been the F150's, though not sure.
Thanks
Rich
Thanks
Rich
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,725
Likes: 2,652
From: SE Florida
The problem mechanical diodes were only in the diesel Superdutys from the start of the 2001 model year until March, 2001. The gas engine Superdutys didn't have them.
The 4R70W in the F150s have had mechanical diodes for years without any problems.
The 4R70W in the F150s have had mechanical diodes for years without any problems.
Hook it, I'll pull it.
Joined: May 2007
Posts: 15,037
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From: Grand Lake, La.
I have an early 01' with 115,500 miles on the trans. With what I have in it, I have never had a problem. Just like the rods, I have forged. Does that make the others bad? I think not.
Postmaster
Joined: Jan 2004
Posts: 4,758
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From: colorado
Originally Posted by Mark Kovalsky
The problem mechanical diodes were only in the diesel Superdutys from the start of the 2001 model year until March, 2001. The gas engine Superdutys didn't have them.
The 4R70W in the F150s have had mechanical diodes for years without any problems.
The 4R70W in the F150s have had mechanical diodes for years without any problems.
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FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
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From: Long Island USA
It was always my understanding that my '01 V10 had the mechanical diode in question.
And there was no recall or I would have certainly had it done
I know there was a TSB about it ...
Here's one:
https://www.ford-trucks.com/tsb/full...hp?tsb=01-13-5
And there was no recall or I would have certainly had it done
I know there was a TSB about it ...
Here's one:
https://www.ford-trucks.com/tsb/full...hp?tsb=01-13-5
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Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,725
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From: SE Florida
Originally Posted by krewat
It was always my understanding that my '01 V10 had the mechanical diode in question.
And there was no recall or I would have certainly had it done
And there was no recall or I would have certainly had it done
They decided that they could leave it in the diesels because the only failure mode that was found was above 4500 RPM. Since the diesel couldn't run that fast it was decided to leave them in for a while, until a better time to change. That time came in March, 2001.
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