mechanical diode failure?
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Junior User
Joined: May 2012
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mechanical diode failure?
01 F350 7.3 sc 4x4 auto 36,500 miles.
15 degrees this morning, started truck and it lurched forward a little....... weird. Let it warm up, took off and it didn't want to shift into second. That symptom is intermittent. There's also a snapping sound coming from the drivetrain somewhere. Did my infamous diode fail? Do I need a rebuild at 36k? Any thoughts or ideas? Thanks in advance!
15 degrees this morning, started truck and it lurched forward a little....... weird. Let it warm up, took off and it didn't want to shift into second. That symptom is intermittent. There's also a snapping sound coming from the drivetrain somewhere. Did my infamous diode fail? Do I need a rebuild at 36k? Any thoughts or ideas? Thanks in advance!
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Junior User
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That's what I figured...... I just got the truck in june but I tow heavy. I knew it would go sometimes but didn't think at 36k. Anything I should consider adding during the rebuild. Torque converter, valve body, I'm looking for something hd but I don't have Bts/Jw money to spend.
Thread Ender
Joined: Dec 2010
Posts: 1,296
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From: SC
So I read in other threads that 4600 rpm under certain circumstances causes the mechanical diode to fail. Why, then, does it matter if a 7.3 has the mechanical diode or not since it never sees 4600 rpm?
Cargo Master
Joined: Jan 2005
Posts: 2,902
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From: Pasadena, Maryland
I dont have a AT in my truck but I've never heard of a 'mechanical diode'. I know a diode does in electronics though.
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Junior User
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It's a one way clutch, my diode was replaced with a sprag style.
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Frmr Ford Trans Engr
Joined: Aug 1999
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From: SE Florida
The truth is that at 4600 RPM it is possible to destroy the mechanical diode in one shift, if the driver knows how to do it. At lower RPM like the diesel turns it takes longer, but they get there, too.
Mechanical Diode is a brand name for a type of one way clutch.
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Junior User
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I brought my truck to a local reputable transmission shop where it was rebuilt with a list of improved parts and upgrades to make the tranny more HD. Billet triple disc tc, valve body improvements for better shifts and increased line pressure for less slip, better clutches, I forget the rest. It was done within a week and cost $3,150. It is disheartening when it happens, especially since I bought the Ford 7.3 for it's reliability - add in a bunch of other stuff I'd rather not have to deal with; hutch, harpoon, 50 cent mod, vc harness chafe, cps failure, od steering column wire, ect, this truck may come up for sale sooner than I expected.
Elder User
Joined: Mar 2012
Posts: 534
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From: Quaker Hill
Not trying to hijack a thread, but my 01 started acting up today, almost like a bad u joint, which its not. Contemplating buying an upgraded HD rebuilt, and installing it myself. How can I flush my tranny cooler before putting in the new tranny?
Fleet Mechanic
Joined: Dec 2010
Posts: 1,546
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From: Wellington, Co
I brought my truck to a local reputable transmission shop where it was rebuilt with a list of improved parts and upgrades to make the tranny more HD. Billet triple disc tc, valve body improvements for better shifts and increased line pressure for less slip, better clutches, I forget the rest. It was done within a week and cost $3,150. It is disheartening when it happens, especially since I bought the Ford 7.3 for it's reliability - add in a bunch of other stuff I'd rather not have to deal with; hutch, harpoon, 50 cent mod, vc harness chafe, cps failure, od steering column wire, ect, this truck may come up for sale sooner than I expected.
If not for FTE it would have gone buy buy a long time ago.