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| 1999 to 2003 7.3L Power Stroke Diesel 7.3L Power Stroke Diesel equipped Super Duty and Excursion. |
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#2
Mon, May 2nd, 2011, 07:00 PM
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I had my truck scanned today. Codes p0603 internal control module ram error, p0783 3-4 shift error, p0781 1-2 shift error, p0732 gear 2 incorrect ratio. About 3 days before I started having tranny problems, my truck died pulling into the parking lot at work and wouldn't restart. I let it set until after work, when I got into my truck, I made sure my chip was firmly seated. I put the key in and it started right up. Is it possible I partially fried my pcm, or maybe it needs to be re-flashed? The shop said the tranny was junk. Yesterday I drained the fluid and dropped the pan expecting to see some shards or something. Nothing in there but some fines and the fluid was little burned. I don't know if I trust this shop or not. I think I will get a second opinion, what do you guys think?
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#3
Tue, May 3rd, 2011, 08:42 AM
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Not a PCM problem.
It's an internal transmission problem. Sounds to me like you experienced a 1-3 shift in your first post. That usually means a broken intermediate sprag....but they usually break and never work again. You won't find pieces in the pan from that failure.....unless you drive it for a few miles after the breakage.
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Tuning, PCM flashing, and burning chips for 7.3s since 2008. Repairing all aspects of 7.3L Powerstrokes for 25 years. Eight 7.3L PSDs in the driveway including a 1994 Crown Vic and 1973 F100/2002 F350. Looking for the next victim.
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#4
Tue, May 3rd, 2011, 06:06 PM
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I put about 50 miles on it before I dropped the pan. I also still have 2nd gear. The tranny holds in first, let up on pedal and it locks into 2nd. Shifts to 3rd and 4th are like butter. I guess I just have a hard time believing my tranny is trashed after a couple of weeks of driving after the chip was put in, I never even made any WOT runs with it. Guess its time for a rebuild. If I go with a BTS or something similar, do I then have to upgrade my FU chip to the FU2 or custom tunes?
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#5
Wed, May 4th, 2011, 08:32 AM
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These transmissions are like glass behind a stock engine. Some live, some don't.
__________________
Tuning, PCM flashing, and burning chips for 7.3s since 2008. Repairing all aspects of 7.3L Powerstrokes for 25 years. Eight 7.3L PSDs in the driveway including a 1994 Crown Vic and 1973 F100/2002 F350. Looking for the next victim.
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#6
Sun, November 6th, 2011, 05:37 AM
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my transmission had the same symptoms... i changed the fluid and filter and drove like that for a year and half before the forward clutch burnt up.
How is it doing these days?
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02 f250, 7.3,4r100 rebuilt at 140k with shift kit and triple disc. Dana 60, 2.5" zone leveling kit, 16x10s, 315/75r/16 Autoenginuity in the Lafayette,La area 
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#7
Mon, November 21st, 2011, 11:20 AM
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recently my trans has been having problems going from 1st to 2nd and it will only shift if i take it to 2800 rpms roughly or let off n then i get a very hard shift. it ended up being the famous mechanical diode or something ford diagnosed it as secondary one way clutch blown. had cody write a tune to skip 2nd and all it well dont have money for a new trans
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