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got 365000km out of my 96 and never serviced the trany or changed oil in the trany.The thing is parked and still shifts like new{with 365000km on it].
 

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Flushed mine at 30k still smelt new. Went 80k more miles flushed and it smelt a little sour. Now 150k on the tuck and I'm about to do it again. If it wouldn't have smelt sour the second time I would have left it.

Now my good friend at work had a 99 with 380k on the tranny never changed his once until T/c started slipping at 380k But this truck was tough for some reason, 400+k miles and still on the original CPSLOL
 

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I operate my vehicle on steep, rough, slow climbing terain that can be very dusty at times. A standard tranny would shine in this enviroment but i'm stuck with an automatic. It doesn't take very long to get the temps up there especially if you are traveling at slow speed with any sort of load.

I make a consistant mountain climb every week and monitor my transmission temps to avoid overheating.

It is interesting to see how the temps drop after a service or how they respond differently using various oil products.

I have had other ford pu's and substituted synthetic fluid over the standard mercon using the same mountain climb - sythetics outperform.

I service my fluid on a regular basis and have had no tranny problems. The temp gauge is a definate assett. ( after market real one, not the stock idot gauge)
 

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I did a dealer flush at 30k - what was I thinking - they couldn't get that right. Due to playing with aftermarket pans (and returning to stock), I've sinced drained the pan and replaced that fluid a couple of times. Fluid has always been in good shape. I'll keep on just draining the pan and replacing with fresh fluid every 30k; along with a new external filter. I would suspect that the flush machines and the chemicals used could have an adverse effect on the tranny. Maybe they would be good for one that went alot of miles on old fluid to clean them out, but if you keep the fluid fresh and clean, you're in good shape.

Mark
 

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We Replace Trannies Monthly At Our Shop Because They Were Not Maintained, Atf Is A Petroleum, It Breaks Down When It Gets Hot And Or Dirty. It Gets Dirty From Internal Transmission Wear. Why Do You Think They Put A Filter In There???? Now Given Better Fluids Are Now Put In Vehicles, Such As Synthetics,, And Aftermarket Additives, And Dual Filters Are Normaly The Case On Diesel Trucks,, In Normal Driving Conditions. Longer Change Intervels Are A Reality. Me,, Under Heavy Towing, Or Loaded Conditions, The Fluid Will Get Hot, Break Down, And If Left Unchanged, Will Eat Up A Transmission.. I Do Mine Every 30 Or 40 K.. I Reccomend The Same To All Of Our Customers.. Synthetics Can Go Much Longer In Transmissions,, 50k To 100k Depending On Driving Habits.. Fact,, Number One Cause Of Transmission Failure Is Heat, Heat Breaks Down The Fluid, When Fluids Shot, The Trans Is Headed South.. I Get My Paycheck Because People Did Not Do Reccomened Maintence, ..
 

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Look at it like this, the oil lubricates the trans bearings, bushings and pumps. The filter strains the clutch material that wears off out of the oil, and also the metal that wears off. If you never change the fluid in the trans, you never put fresh lube in, and never change the filter. Would you do that to your motor? I doubt it, so why do so many think it is a good idea to not change the trans fluid?
 

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FRANK-D-TANK said:
We Replace Trannies Monthly At Our Shop Because They Were Not Maintained, Atf Is A Petroleum, It Breaks Down When It Gets Hot And Or Dirty. It Gets Dirty From Internal Transmission Wear. Why Do You Think They Put A Filter In There???? Now Given Better Fluids Are Now Put In Vehicles, Such As Synthetics,, And Aftermarket Additives, And Dual Filters Are Normaly The Case On Diesel Trucks,, In Normal Driving Conditions. Longer Change Intervels Are A Reality. Me,, Under Heavy Towing, Or Loaded Conditions, The Fluid Will Get Hot, Break Down, And If Left Unchanged, Will Eat Up A Transmission.. I Do Mine Every 30 Or 40 K.. I Reccomend The Same To All Of Our Customers.. Synthetics Can Go Much Longer In Transmissions,, 50k To 100k Depending On Driving Habits.. Fact,, Number One Cause Of Transmission Failure Is Heat, Heat Breaks Down The Fluid, When Fluids Shot, The Trans Is Headed South.. I Get My Paycheck Because People Did Not Do Reccomened Maintence, ..

Dang! That Was Hard To Read. :poke:
 

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fellro86 said:
Look at it like this, the oil lubricates the trans bearings, bushings and pumps. The filter strains the clutch material that wears off out of the oil, and also the metal that wears off. If you never change the fluid in the trans, you never put fresh lube in, and never change the filter. Would you do that to your motor? I doubt it, so why do so many think it is a good idea to not change the trans fluid?
Good point. One other very important point even the other professionals don't get: Clutch lining and metal from locking torque converters doesn't go directly to the pan filter. I make changes in my rebuilds so that doesn't happen. :)

The flush machine is used as a faster and cheaper way to change fluids. Fluid can still be changed correctly without a torque converter drain plug using the cooler line. I change fluids without a flush machine.

The real advantage a flush machine should only be used for: To clean the tiny passages of the transmission cooler. Then the amount of solvent it leaves behind would be worth the benefit of pressure cleaning the passages. I take the cooler out and hot tank it instead. Just like the radiator shops do. I do pressure flush the cooler lines. :Thumbup:
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TDG Mafia - Booze Runner
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When this stock one dies, I'll change the fluid since a better one (tranny that is) will go in :evil: After that prolly every 60K depending on my abuse :sofa
 

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Sumo Blue
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527 Posts
Took my own ATF (AMSOIL) to a local garage and watched them flush mine. Cost $50 versus the dealership's $120 and I know MY stuff went into the pan.

FWIW, the service manager at the dealership said they don't change the filters when then do a tranny flush. The way he explained it (and not saying I agree, just telling you what he said) was this: when you hook the tranny up to the machine, it backflushes the filters.

Might want to ask the dealership exactly what they are going to do......

--Snake
 

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every 30-50k
have a friend of mine who just rolled over 350k on his SD with the original 4R100 changing the fluid every 30k and he uses his truck as a work truck.
 

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3,754 Posts
change my own suppose never get it ALL out of the lines and torque but good en ough.
 
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