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Old 02-09-2016, 09:23 AM   #1
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How often to change transmission fluid?

For the newer Ford diesels with the 6 speed auto transmission that is used 75% towing heavy fiver, when should transmission fluid be changed? The Ford maintenance guide only says to change it at 150,000 miles. It does not differentiate between towing or not. I've always believed that when towing heavy, transmission fluid life is shortened due mostly to higher operating temperatures, and oil shear. So, what are others doing?
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Old 02-09-2016, 09:28 AM   #2
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Does the manual address tough service? My Chevy manual give general service and rough service recommendations.

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Old 02-09-2016, 09:29 AM   #3
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Unless your a Very Lucky person I would change before 150.000 miles! Youroo!! Most MFG have a "Severe Use" section,which Heavy Towing falls under!
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Old 02-09-2016, 09:37 AM   #4
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I just looked at mine for comparison.. 97,500(odd number) for standard duty, 45,000 for severe duty.. Again on a Chevy diesel, but I'd guess for cannot be to do far off. Odd part, my gas Manuel said nothing about transmission fluid changes on standard use, only severe usage at 45,000 as well.

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Old 02-09-2016, 09:40 AM   #5
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I just looked at mine for comparison.. 97,500(odd number) for standard duty, 45,000 for severe duty.. Again on a Chevy diesel, but I'd guess for cannot be to do far off. Odd part, my gas Manuel said nothing about transmission fluid changes on standard use, only severe usage at 45,000 as well.

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Even if you change your transmission fluid every 40-45K miles like I do, you still will not get much more than 400K out of your auto transmission.

Take care of your transmission. It is the weak link in the drive train.
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Old 02-09-2016, 09:42 AM   #6
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Even if you change your transmission fluid every 40-45K miles like I do, you will not get much more than 400K out of your auto transmission.

Take care of your transmission. It is the weak link in the drive train.
Ok, thanks, I guess

400k miles ain't half bad in my book.. I'll be happy if I make it to that...

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Old 02-09-2016, 09:44 AM   #7
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Ok, thanks, I guess

400k miles ain't half bad in my book.. I'll be happy if I make it to that...

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I have never found anyone to rebuild an Aisin transmission. They run around $7000 new.
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Old 02-09-2016, 09:46 AM   #8
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Even if you change your transmission fluid every 40-45K miles like I do, you still will not get much more than 400K out of your auto transmission.

Take care of your transmission. It is the weak link in the drive train.
How many RV tow vehicles have you had for you to have Data that "400.000 Miles"? Youroo!!
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Old 02-09-2016, 09:51 AM   #9
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How many RV tow vehicles have you had for you to have Data that "400.000 Miles"? Youroo!!
Let me see, I buy a new one about every 5 years and I have been towing trailers for over 25 years, so that makes about 5 or 6.
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Old 02-09-2016, 10:00 AM   #10
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Let me see, I buy a new one about every 5 years and I have been towing trailers for over 25 years, so that makes about 5 or 6.
Oh I see you are a Transporter that puts 400.000 miles on your Truck in 5 years! Boy not much time to Camp! Youroo!!
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