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I've got 225,000 on the tranny in my 2002 f350 7.3 PS and I am not having any problems. Every winter I haul fairly heavy (10-15K) in firewood all over Nevada. I have a 6.0 cooler on the stock tranny and change the fluid every 35-50K. I know how to drive and I don't baby it but I use common sense in pulling the loads up and down the hills in Nevada. Many guys I know have already replaced their trannys with under 200K. Just how long can one of these proported weak ford trannys last......300K, 400K, 500k???How many miles have you got on your tranny that you pull loads with. I am speaking of the tranny that comes stock with the 99-03 ford diesels. Just wondering......
 

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I've seen one that lasted 369,000 in an ambulance, and it never even had a fluid change. The only reason it stopped at that mileage is the ambulance was wrecked.
 

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The "almighty Allison" doesn't hold up any better. It's just the name keeping them going.
 

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I have over 200,000 on mine and it is still running good.
 

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I have over 250,000 on mine with no issues yet.
 

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Well first tranny made 78k,,
BTS tranny made 140K
Both with towing 10k trailer
ALL with changing fluids regularly
It's hit or miss with 4R100
I'd say run it until ATF turns dark,,
Then replace tranny
 

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I got about 300k out of my stock pulling heavy regularly then total annihilation 500 miles from home. Replacement tranny only made it 50 miles! Replacement of the replacement now has over 30k but I've never felt it was quite right so I'm preparing myself for another at some point and plan to go with the heaviest duty trans I can find and afford!
 

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345k on my original tranny. While I don't tow all that often, I do run it hard. I've changed the fluid once or twice in it's life. But I did do the sonnax valve and tricumulator fairly early in it's life. So far, it's still working. Some days it seems to feel a little weak, but other days it's just fine.
 
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