To change transmission fluid, or not to? - Ford Powerstroke Diesel Forum
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post #1 of 21 Old 04-05-2017, 05:14 AM Thread Starter
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To change transmission fluid, or not to?

Ok folks, my truck is about to hit 100k and sadly the transmission fluid has never been changed. I bought it used and it has detailed service records from the previous owner (lucky me) but nothing about the tranny fluid being changed. My question is do I flush or do I simply drain and change? I've always been taught if it goes over the recommended mileage for a flush then don't flush it as you may cause more issues. HELP!

2012 F-250 Supercrew - Pro-Comp 6" - 22x12 Hostile Sprocket's - 37" Toyo R/T's - AFE Elite Intake - 5" Diamond Eye Exhaust - SCT X4 & Tyrant Tunes - Sinister EGR Delete


Previously- 2006 Ram 2500, 5" turbo back, Crazy Larry tuned, fried injector harness, 6 toasted injectors, and one melted transmission.....

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post #2 of 21 Old 04-05-2017, 05:52 AM
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I found myself in a similar situation when I bought my F450 with 165,000 miles. I changed the fluid, but did not flush. i am not a big fan of flushing. The hydraulic system flushes the system every time you drive. And hydraulic fluid is pretty "high detergent" by nature. I think flushing a transmission is a waste of money on a good-functioning unit that has not had something run through it that shouldn't be there. Just my opinion.


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'06 F250 4x4, 251,xxx hard miles, IPR egr delete and coolant filter, blue spring, billet wheel, 4" turbo back, Atlas 40, SCT Livewire, Archoil, Mobil 1 Synthetic, Cat elc, Warn bumper and 16.5 winch in front & aftermarket mystery bumper in rear, dent in floorboard under throttle
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post #3 of 21 Old 04-05-2017, 05:58 AM
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I can't quite figure out the whole transmission service debate. I don't flush but I do change the fluid & filters every 30k so I've done it 6 times over the 180k I've put on it since the truck was new. I was camped next to another 6.0 on Sunday. The guy was the original owner, he's never changed the fluid and he's got 280k. Neither of us has ever had any transmission trouble so it makes me wonder why I change mine so often. Right or wrong, I'll be draining mine again at 210k!


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post #4 of 21 Old 04-05-2017, 06:02 AM
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Drain, filters, refill.
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post #5 of 21 Old 04-05-2017, 06:38 AM Thread Starter
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Thanks fellas, I am glad to know I haven't been the only one with this dilemma!

2012 F-250 Supercrew - Pro-Comp 6" - 22x12 Hostile Sprocket's - 37" Toyo R/T's - AFE Elite Intake - 5" Diamond Eye Exhaust - SCT X4 & Tyrant Tunes - Sinister EGR Delete


Previously- 2006 Ram 2500, 5" turbo back, Crazy Larry tuned, fried injector harness, 6 toasted injectors, and one melted transmission.....

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2015 Pierce Velocity Industrial Pumper
2013 F-550 Haz-Mat/Rescue
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post #6 of 21 Old 04-05-2017, 07:43 AM
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JPW,
I'm a trans specialist since 1988. I now work in the prototype dept, with a certain company that has the same name as the one on your steering wheel.

Guys are right. Just drain refill and top off. Those flushing agents can really screw things up. I used to do them when I worked at the dealerships and started getting units coming back. The seals in the tranny were all mushy. We sent the seals to that company I work for and they found that the flushing agents was causing the seals to mush out. Granted that was back in late 1998 and I quit using the flushing agents. For my 1999 7.3 truck that I plow with and tow cars, haul the big round bales plus wood and tree removal. (Yep you guessed it I'm also a farm boy.)
My truck went 245,000 miles till the engine oil pan and injectors had enough, original parts, the trans was still kickin butt. I drained the trans and converter every 30K and flushed the oil every 50K. How I flushed was removed the return cooling line from the trans cooler into a bucket and ran a case,20qts of tranny fluid through it. Its a little overkill but took the 20 to get the oil red again. I then put the cooling line back on and topped off the trans oil level.
The trans that Ford makes in our trucks, seems pretty tough, I bought a 2011 6.7 F350, wow what a diff. A side note at work...
We just had a trans and transfercase donated to us with 800K on it. The customer used it to haul products from one side of the US to the other. That was a F350 2011 DRW Lariat. The old truck was parted out for some reason. They are testing the trans on the dyno's right now and its still kickin hard.

Just my 2 cents.

GC
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post #7 of 21 Old 04-05-2017, 10:40 AM
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If anyone wanted to use something other than transmission fluid for flushing even when using a machine I'd tell them to get bent. I had my tech drain the pan and refill. I got to look and see if/when the filter is required to be changed.
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post #8 of 21 Old 04-05-2017, 02:33 PM
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JPW,
I'm a trans specialist since 1988. I now work in the prototype dept, with a certain company that has the same name as the one on your steering wheel.
Just my 2 cents.

GC
Welcome to the Org. I sure hope you stick around. If that's your 2 cents you are worth over $5000 to this forum. Your advice to other and future members is invaluable. Where you from farm guy (obviously not a boy anymore)?

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post #9 of 21 Old 04-06-2017, 04:47 AM Thread Starter
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Originally Posted by gcross308 View Post
JPW,
I'm a trans specialist since 1988. I now work in the prototype dept, with a certain company that has the same name as the one on your steering wheel.

Guys are right. Just drain refill and top off. Those flushing agents can really screw things up. I used to do them when I worked at the dealerships and started getting units coming back. The seals in the tranny were all mushy. We sent the seals to that company I work for and they found that the flushing agents was causing the seals to mush out. Granted that was back in late 1998 and I quit using the flushing agents. For my 1999 7.3 truck that I plow with and tow cars, haul the big round bales plus wood and tree removal. (Yep you guessed it I'm also a farm boy.)
My truck went 245,000 miles till the engine oil pan and injectors had enough, original parts, the trans was still kickin butt. I drained the trans and converter every 30K and flushed the oil every 50K. How I flushed was removed the return cooling line from the trans cooler into a bucket and ran a case,20qts of tranny fluid through it. Its a little overkill but took the 20 to get the oil red again. I then put the cooling line back on and topped off the trans oil level.
The trans that Ford makes in our trucks, seems pretty tough, I bought a 2011 6.7 F350, wow what a diff. A side note at work...
We just had a trans and transfercase donated to us with 800K on it. The customer used it to haul products from one side of the US to the other. That was a F350 2011 DRW Lariat. The old truck was parted out for some reason. They are testing the trans on the dyno's right now and its still kickin hard.

Just my 2 cents.

GC
THANK YOU!! I'm much more comfortable about the whole deal now. I'll just drain and refill for now.

2012 F-250 Supercrew - Pro-Comp 6" - 22x12 Hostile Sprocket's - 37" Toyo R/T's - AFE Elite Intake - 5" Diamond Eye Exhaust - SCT X4 & Tyrant Tunes - Sinister EGR Delete


Previously- 2006 Ram 2500, 5" turbo back, Crazy Larry tuned, fried injector harness, 6 toasted injectors, and one melted transmission.....

My "Other Rides"
2015 Pierce Velocity Industrial Pumper
2013 F-550 Haz-Mat/Rescue
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post #10 of 21 Old 04-07-2017, 04:35 AM
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@Patriot ,
I updated my profile. Michigan is where Im from. Lil place called Owosso.
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