mechanical diode in trans?
Thread Starter
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Freshman User
Joined: Jul 2007
Posts: 37
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From: Buffalo
mechanical diode in trans?
I have seen a few threads on here talking about a mech. diode in the trans. of the 01. I was wondering what is this and why is it bad. My truck had a rebuilt trans in it when i bought it and wondering if you could tell if it still had this. You wouldn't think they would put something bad back in the truck.
Post Fiend
Joined: Feb 2006
Posts: 11,892
Likes: 2
From: Middle Tennessee
Have a look here at the TSB. If you need help with the dataplate for build date let me know. First is year, second is month via letter, and third is date of month. If it was rebuilt you have no way of knowing if the intermediate assembly was replaced. The retro conversion or diode fix costs about $250 just for the parts. So if the diode was not failing, it may not have been replaced.
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Freshman User
Joined: Jul 2007
Posts: 37
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From: Buffalo
Do these go out at random or do they normally last a certain amount of miles? My trucks build date is 01/01 so it did have one from the factory. I am guessing that they replaced it because I haven't had any troubles for the 30,000 or so miles that I have had the truck.
Senior User
Joined: Feb 2005
Posts: 416
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From: Mid Michigan
They do go out in random but usually within 100,000 or near there. The diode is a three part device ( I believe ) that somehow allows the trans to shift up or down. It looks like a ring that slips into another ring then into a housing ring so to speak. I,m no trans mechanic but just went through this last week. The inner ring has a slight shoulder on it and mine was missing half of this shoulder and took out a few other items BUT I didnt drive it much once I realized what my trans was doing so major damage was slight. I needed a new assembly set (77.00 ) a filter,set of pump gears (26.00 ), drum conversion diode kit (219.00 ) then I desided to do the torque converter ( 325.00 ) and a tugger kit (127.00 ) which I am VERY PLEASED with. Whole job was 1450.00 with fluid, labor, parts . My trans has never shifted so good, I mean its unreal compared to stock, it is SMOOTH, solid and I was told should pull a house if needed. ALSO I am going to instally myself a additional trans cooler to eliminate heat better which is recommended in the 01 such as mine.
Laughing Gas
Joined: Jul 2003
Posts: 1,157
Likes: 1
From: Littleton, Colorado
Clint40, you should also think about installing a transmision filter on the return line from the cooler just in case there's a few shrapnel pieces that didn't get flushed out. It would definitely be a buzz kill if something happened to the new one. The one Ford recommends with every rebuild is just a Magnafine. For $15-$20 it's cheap insurance.
Austin
Austin
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Laughing Gas
Joined: Jul 2003
Posts: 1,157
Likes: 1
From: Littleton, Colorado
hrhankypoo,
They rebuilt plenty of them with the same parts lousy parts in the early days. That was before they figured out ( decided to do something ) intermediate-one way clutch, brake drum and clutch plates and the associated parts.
If your transmission was rebuilt in the last 2-3 yrs, you're more than likely okay. If you start getting funky shifting especially involving second gear or low gear when you mash on it, you might want to investigate it further.
Other than that, keep up on the maintenance and enjoy it.
Austin
They rebuilt plenty of them with the same parts lousy parts in the early days. That was before they figured out ( decided to do something ) intermediate-one way clutch, brake drum and clutch plates and the associated parts.
If your transmission was rebuilt in the last 2-3 yrs, you're more than likely okay. If you start getting funky shifting especially involving second gear or low gear when you mash on it, you might want to investigate it further.
Other than that, keep up on the maintenance and enjoy it.
Austin
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Senior User
Joined: Feb 2005
Posts: 416
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From: Mid Michigan
Originally Posted by 62trvler
Clint40, Did you have a dealer perform the work or some independant? That far along and I might be thinking of a BTS tranny. I need to find my build date first.
Post Fiend
Joined: Feb 2006
Posts: 11,892
Likes: 2
From: Middle Tennessee
Originally Posted by hrhankypoo
My trucks build date is 01/01 so it did have one from the factory.
Lead Driver
Joined: Jun 2003
Posts: 8,298
Likes: 25
From: Damon (South East Texas)
When I rebuilt my trans at 128k, the mechanical diode was still in good shape. The center support bearing, for the rear of the overdrive planetary, came apart. This little $9 bearing was the cause of my trans woes. The "diode" is a ratchet type one-way clutch and the replacement is a sprag type. I had to replace the direct clutch drum also to retrofit the clutch. But, I saw recently, there is now a replacement for the "diode" that allows you to reuse the original drum. This saves you a couple of $100.
I beefed up my trans with more and a better grade of clutches, 300M input shaft, and a triple disc billet converter. I also installed the TransGo reprogramming and converter lock-up kits.
I beefed up my trans with more and a better grade of clutches, 300M input shaft, and a triple disc billet converter. I also installed the TransGo reprogramming and converter lock-up kits.
Last edited by mueckster; Feb 3, 2008 at 10:32 PM.