2003 F250 7.3L transmission problems - Diesel Forum - TheDieselStop.com
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'99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 08-30-2012, 08:58 AM   #1 (permalink)
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2003 F250 7.3L transmission problems

I got a 2003 f250 7.3 diesel pick up. I been having allot of transmission problems with it. Since i have had it been threw 4 transmissions 2 of them being under warranty and 2 in the last 2 years. Has a 6 inch lift with 37 inch tires it. Last two times brought it to the dealer ship n they put a new one in. first time told me to get a programmer n set the tire size and said that was the problem. I did that and just had to bring it to ford because the over drive light started flashing and had to get a new trany put in. they said the planetary gear was shot. so i just got a new trany under warranty but i need to figure this problem out. i dont know if it could be the drive shaft or rear or what. need help.
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Old 08-30-2012, 09:09 AM   #2 (permalink)
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First - get a transmission temperature gauge. The gauge on the dash is a glorified idiot light and won't let you know what is going on until too late. Second, get extra cooling. An upgrade to a 6.0 cooler is a good option. Third, clean your radiator fins. The oil to water cooler is in the bottom of the radiator and if the radiator gets gunked up, you'll cook transmissions. Fourth, get appropriate gearing for your tire size. Stock gears are 3.73 - that's good for stock tires. One of the gearing gurus that has all the tire size dimensions memorized can tell you which gears would be best but basically you need to know the difference in diameters between stock and your monsters and get a ratio the equivalent difference.
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2003 F-250 XLT Crew Cab 7.3L, Chrome BigTex Grille Guard, Quad pillar - 3 ISSPRO gauges (trans, pyro, boost) and DP-Tuner F6; Roush fuel pressure / temperature / oil pressure gauges, Ford Severe Duty AIS, 31 row 6.0 transmission cooler, ScanGauge II, Marinco mod, Walker BTM
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Old 08-30-2012, 09:20 AM   #3 (permalink)
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thanks
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Old 09-01-2012, 09:29 PM   #4 (permalink)
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Re: the 6.0L oil cooler...is that a complicated job or something owners can do on their own?
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Old 09-01-2012, 09:50 PM   #5 (permalink)
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Its so easy a third grader can do it. Here's how: 6.0 Transmission Cooler Write up.pdf
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2003 F-250 XLT Crew Cab 7.3L, Chrome BigTex Grille Guard, Quad pillar - 3 ISSPRO gauges (trans, pyro, boost) and DP-Tuner F6; Roush fuel pressure / temperature / oil pressure gauges, Ford Severe Duty AIS, 31 row 6.0 transmission cooler, ScanGauge II, Marinco mod, Walker BTM
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Old 09-02-2012, 12:23 PM   #6 (permalink)
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We'll having a 6.0L cooloer is a great addition, has burnt fluid be the cause of any the failures?? Are you towing alot or a bunch of weight ?
The dealer reprogrammed my truck for my upgraded 33" tires for like $60, I believe it was a 1/2 hours labor charge. I had it done to put the trans shifting back in the correct times.
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Old 09-02-2012, 06:36 PM   #7 (permalink)
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Where is a good place to buy the 6.0 cooler?
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Old 09-02-2012, 07:10 PM   #8 (permalink)
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Tousley Ford - best prices around. You can get the part number in the how to posted above.
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2003 F-250 XLT Crew Cab 7.3L, Chrome BigTex Grille Guard, Quad pillar - 3 ISSPRO gauges (trans, pyro, boost) and DP-Tuner F6; Roush fuel pressure / temperature / oil pressure gauges, Ford Severe Duty AIS, 31 row 6.0 transmission cooler, ScanGauge II, Marinco mod, Walker BTM
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Old 12-26-2014, 12:23 PM   #9 (permalink)
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i own a F250 superduty 7.3 turbo 4x4 king ranch with an automatic transmission. i was driving about 35 mph when i heard a loud click sound. then had no forward or reverse. also noticed when shifting park and neutral RPMs are at 800 when in reverse and drive RPMs go to 900 RPMs and overdrive switch on shifter doesnt light up either. Any thoughts?????
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Old 12-26-2014, 12:46 PM   #10 (permalink)
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My thought is that something mechanical broke inside the transmission. Either replace or rebuild the trans.
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Old 12-26-2014, 12:47 PM   #11 (permalink)
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Mark - don't you have a trick to rule out the transfer case - I think you asked someone once, "Does it hold in park?"

In other words, if you went out and pushed it while it was in park, would it move?
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2003 F-250 XLT Crew Cab 7.3L, Chrome BigTex Grille Guard, Quad pillar - 3 ISSPRO gauges (trans, pyro, boost) and DP-Tuner F6; Roush fuel pressure / temperature / oil pressure gauges, Ford Severe Duty AIS, 31 row 6.0 transmission cooler, ScanGauge II, Marinco mod, Walker BTM
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Old 12-26-2014, 04:13 PM   #12 (permalink)
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Good point. If the truck won't roll when in park, the problem is in the transmission. If the truck moves more than a foot or two in park, the problem is in the transfer case.
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