tranny problem? Need help quick

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Aug 11, 2011 | 11:15 PM

JustinXTLR

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tranny problem? Need help quick

Alright so my baby is on the side of the road cause i was scared to drive any further. Now for what is happening when i started to go the tranny did not want to shift, once i let out of the throttle it would should up, but then same thing. wouldnt shift again till i let out. Coming to a stop there was this jerk and loud thud. she is very slow like there is something holding her back. it was to dark to check my fluid. Ill look in the morning. But any ideas on where i need to start if the fluid level is good?

Thanks all

Aug 12, 2011 | 07:50 AM

Mark Kovalsky

Frmr Ford Trans Engr

Joined: Aug 1999

Posts: 24,739

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From: SE Florida

Assuming you have a 2001 7.3L automatic with the original transmission, it's probably the mechanical diode. That's a type of one way clutch.

When the mechanical diode fails the symptom is that it won't shift 1-2 until very high RPM, or until you let off the go pedal. The fluid will probably look fine. The only way to fix this is to rebuild or replace the transmission.

Aug 12, 2011 | 09:21 AM

JustinXTLR

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ahhh thats what i was afraid of. now does it make any difference that it was just sudden?

Aug 12, 2011 | 09:27 AM

carltonwebb

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That what they do . Where in GA are u?

Aug 12, 2011 | 09:28 AM

JustinXTLR

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Quote:

Originally Posted by carltonwebb

That what they do . Where in GA are u?

woodstock canton area

Aug 12, 2011 | 10:34 AM

Mark Kovalsky

Frmr Ford Trans Engr

Joined: Aug 1999

Posts: 24,739

Likes: 2,669

From: SE Florida

Quote:

Originally Posted by JustinXTLR

now does it make any difference that it was just sudden?

Yes, it does. It confirms that it's the mechanical diode.

Aug 12, 2011 | 11:07 AM

JustinXTLR

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okay, so just some more info on the tranny problem. Still the same as last night. fluids were perfect, but now there is some grinding noise. Is that still going to be a mechanical diode and if so, is there a rebuild thread on our trannys somewhere. I really wanna tackle this myself along with a buddy that works on peterbuilts.

Thanks to all for helping me! i freaking love this site.

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Aug 12, 2011 | 11:31 AM

Brother Les

Cargo Master

Joined: Oct 2007

Posts: 2,712

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From: BoCoMo

Quote:

Originally Posted by JustinXTLR

Don't drive it anymore until you find out what is coming apart. Read up on the 'diode' issue and if there is a way to overhaul the tranmission with out replacing the 'diode' section then do that. The 'diode' was only put in for a short time for that year and you should be able to get everything that you need to leave it out.

Do you know how to use the 'search this forum' key? it is on the main 7.3 page..... on the right side, upper, center. type in key words and threads will come up to help you.

Also, some more brothers will be along to help you out.

bottom line.... get rid of the diode parts...