2001 f250 not wanting to shift into second gear - Ford Powerstroke Diesel Forum
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  #1  
Old 09-07-2012, 12:15 AM
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2001 f250 not wanting to shift into second gear

Hello gentlemen

I have an 01 7.3l f250 crew cab platinum edition with 180k

After putting a TS chip in it yesterday the transmission will not shift into second gear unless I let off the throttle and let it come down to an idle. I unplugged the chip and it still Does the same thing. All other gears seem to shift fine. Fluid is full and doesn't smell burnt..

Any help Would awesome

Thank you joe
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Old 09-07-2012, 12:23 AM
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01 says it all, has a diode trans. Pretty common problem for that to fail.
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Old 09-07-2012, 12:29 AM
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Is that something that can be fixed with out removing the tranny? Or will the tranny need rebuilt or replaced?

What's the best route?
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Old 09-07-2012, 12:41 AM
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The real fix for it is a tranny rebuild. There is more stuff to check before you just tear it apart, so don't get the idea I am telling you to just rip it apart. I'm not the smartest guy on the 4r100, but the 2001 have a mechanical diode that fails and causes it not to shift into 2nd. Have there been any other issues at all with it lately?
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Old 09-07-2012, 12:44 AM
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No there hasn't been any issues at all. Doesn't seem to slip.

So your saying that it can't be fixed by dropping the pan?
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Old 09-07-2012, 12:53 AM
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Nope. usually people fix it by putting in a built trans. The newer model trucks don't have the issue. Let me see what info I can dig up pretaining to the diode and I'll post it here for you.
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Old 09-07-2012, 12:56 AM
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Many people have had this problem. The problem is 2001 4x4 f350 diesel with the 4r100 tranny. That was where Ford switched to a mechanical diode one way clutch. This clutch is used for the 1-2 shift. When it fails, and it does, it will only shift 1-2 when you let off the go pedal. After a while it won't shift 1-2 at all, and the parts that are breaking off of the mechanical diode are going all over the trans.

That trans must come out and be rebuilt or replaced. Sorry.
__________________

copied and pasted from the smartest 4r100 guy I know (former ford automatic transmission engineer)
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Old 09-08-2012, 06:13 AM
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get ahold of TS, and see what they say.
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Old 09-08-2012, 11:57 AM
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Post #5... The guy is probably the smartest trans guy I've met.
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Old 09-08-2012, 05:35 PM
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TS told me to go pound sand and said my tranny was junk before the chip.
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