No mechanical diode!
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Elder User
Joined: Oct 2007
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From: NJ
No mechanical diode!
I checked my tranny build date- I've got one from June 19, 2001. From what I've read (actualy it was Mark K on dieselstop) there were no mechanical diodes installed after March 2001. I'm excited! So, does this mean my tranny will stand up to a chip better?
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,703
Likes: 2,624
From: SE Florida
The easy visual check is that if it was built between July, 2000, and March, 2001, it had the mechanical diode. Before July, 2000 and after March, 2001 they did not have the mechanical diode.
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Elder User
Joined: Oct 2007
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From: NJ
Look on the driver's side sticker on the tranny. There is a code. Mine was BD-1F19. This is dissected to 1=2001, F=6th month=June, 19= 19th. So, mine was built JUne 19, 2001. This would seem to be more accurate than reading the doorsticker, just in case the tranny sat around for a while before it was installed.
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Elder User
Joined: Mar 2009
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From: eastern shore,MD
what is so bad about this trans. not sure if i have one or not, but i just had my trans rebuilt about a year ago and it is holding up well. i told the guy that built it ( a trans shop in my town) that i wanted it beefed up. and i went with a tugger kit. is the problem something that can be fixed or not?
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Posting Guru
Joined: Mar 2007
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From: East Peoria, IL
yes, anyone who knows anything about the 4r100 should have replaced the immediate drum and sprag assembly with the non-mechanical diode version used in all the other 4r's.
after all, most rebuild manuals specifically state, "if your tranny has these parts, DO NOT REUSE THEM"
after all, most rebuild manuals specifically state, "if your tranny has these parts, DO NOT REUSE THEM"
Fleet Mechanic
Joined: Nov 2008
Posts: 1,573
Likes: 4
From: Seattle
Had to run out and get under my truck, just in case I got lucky..........no. My tranny sticker is BD-0L20 (December 20, 2000). Oh well.
Here's the weird thing. My door sticker build date is November 2000. How does that work?
Here's the weird thing. My door sticker build date is November 2000. How does that work?
Postmaster
Joined: Jan 2009
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From: Suffolk, VA
Post Fiend
Joined: Feb 2007
Posts: 14,541
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From: Dallas-Ft. Worth
LOL... I know how you feel. Just now having my first cup.
And I think the answer is they built the truck, and it may have set a month before the engine & trans went in. That would be my guess anyway.
And I think the answer is they built the truck, and it may have set a month before the engine & trans went in. That would be my guess anyway.
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,703
Likes: 2,624
From: SE Florida
What probably happened is that the original trans was replaced shortly after the truck was built.