97 7.3 brand new tranny shifts out of OD - Ford Powerstroke Diesel Forum
 
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post #1 of 5 Old 06-29-2014, 07:30 PM Thread Starter
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97 7.3 brand new tranny shifts out of OD

So my friend has a 97 7.3L F350 with 200k miles on it. He has owned it for 4 years and ever since he bought it, the tranny will randomly slip out of OD while driving. It will sometimes even shift down to 3rd.

He just had his buddy mechanic put a new transmission in it hoping it would solve the problem and it did not. They also replaced the brake light switch at a different time in hopes too that would fix it, but it did not.

We were thinking of replacing the ECM.

Do you guys have any ideas on what we should do to fix this?

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post #2 of 5 Old 06-30-2014, 05:28 AM
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Not sure what you mean about "even" shifting to third. When it shifts out of OD, the only place it can go is into third. In any event, instead of throwing parts (and esp. expensive ones) at it, get it on a device that will read real time data while it happens.
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post #3 of 5 Old 06-30-2014, 05:58 AM Thread Starter
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Yeah I meant it kicks out of OD into 3rd randomly. What will the real time data be able to tell you? What do you look for?

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post #4 of 5 Old 06-30-2014, 07:35 AM
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Someone who's run AE (or whatever) on an automatic truck would have more info, but off the top of my head, I'd say torque converter lockup status (and any other torque converter info), brake switch status, any tranny-related P-codes of course, tranny temp, line pressure.
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post #5 of 5 Old 07-11-2014, 07:46 PM
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Good suggestions here. Your buddy's mechanic doesn't know what he is doing, find another. I don't either, that's why I don't call myself a mechanic. I suspect the problem is either a burnt bulb in the brake light, turn signal, rear 'third light' bulb socket, (does he have LEDs? They must have resistors.) or its the MLPS (Manual Lever Position Sensor) itself, or the connector going to it is dirty (disconnect, spray contact cleaner then reconnect using a little dielectric grease), or the shifter cable itself is out adjustment. In that order or diagnosis.

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