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Dec 16, 2012 | 09:58 AM

sglass57

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Joined: Nov 2012

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My 2000 f250 I think the 2 gear is going out it is a automatic and when I am starting at a stop sing the truck gets up to like 30 and it's at like 3500 rpm any idea what I can do or what it is

Dec 16, 2012 | 10:21 AM

PaysonPSD

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Joined: Nov 2007

Posts: 9,549

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From: Payson, AZ

Quote:

Originally Posted by sglass57

My 2000 f250 I think the 2 gear is going out it is a automatic and when I am starting at a stop sing the truck gets up to like 30 and it's at like 3500 rpm any idea what I can do or what it is

It sounds like the Mechanical Diode problem but your truck shouldn't have one. Check the tranny biuld date.

Here's some Mechanical Diode info:

Mechanical Diode Tranny Build Dates
2001 vehicles equipped with 4R100 transmission, having a transmission build date between 7/27/2000 and 3/23/2001.

Roland (mueckster) 04-15-2008
The trans does have its own build date located on the tag on the trans case (left side ,rear).
4th line down should show BD- #Letter##. This is the build date year/ month/ day.
Example : BD-1D28 1=2001 D=April (A=Jan, B=Feb...12=Dec) 28=Day of Month.
Using his example tranny Build Date is Jan 28, 2001

Mark Kovalsky 01-03-2009
The mechanical diode was in the diesels from the start of 2001 model year (July, 2000) and left production in March, 2001.

Cody (cleatus12r) 01-03-2009
If anyone is still interested, the "mechanical diode" was the replacement for the one way roller clutch previously (Intermediate one way clutch) used in the E4OD and 4R100s. After Ford found out that the diode wouldn't work in the gasser trucks (they exploded when shifted at 5300 RPM), they decided that they should stick with the proven and slightly more robust design. It is a mechanical device that allows rotation in one direction but not the other. It is used for the 1-2 shift when in drive range. When the "diode" was used, it replaced the roller clutch with a sprag that is inherently weaker. High power/high RPM 1-2 shifts are what kills the intermediate one way in the diesels.
Mark Kovalsky 01-03-2009
The gas engine trucks blew up the diode at 4600 RPM if the driver lifted his right foot just as the WOT 1-2 shift started, then put it right back on the floor. The person that discovered this was able to do it on 100% of the trucks he tried it on. That's why they left it in the diesels, they couldn't run 4600 RPM.