[snakebitten]

Snake, trans flush machines are loaded with a specific amount of new fluid. It's more like fluid exchange. The flush part is when you add something like a BG product first to "clean" trans.
Some times this causes issues with transmission afterwords.
I like just a fluid exchange then you know almost all the fluid is changed.
Coolant flush machines are similar. One tank for new fluid, one tank for old fluid. And yes the can be expensive

Yes sir, understood. But I was imagining that the reason it can cause problems is the procedure might not be sufficient for addressing the potential to loosen and then not extract all the deposits.

If "flushing" was capable of using as much fluid as necessary, as well as physically doing things like reverse flow back and forth, and or even vibrate/oscillate in order to prohibit residue from getting trapped in cavities and passages........

Just imagining what machine and procedure might possibly be capable of NOT risking making things worst when you are attempting to revive a high mileage transmission.

Even if the procedure would have a high co$t, if it proved to be successful it would be a fraction of the cost of a transmission rebuild.

 

[butthead]

While I like the BG trans service, I do not agree with the induction service. It should not be necessary, passing it thru a running engine and combustion cycle out the tailpipe either does nothing at all, or can dislodge chunks to pass thru the combustion chamber potentially causing damage.

To add to the trans service, I asked for a filter change also, the pan drop and filter change was done after the BG service. Probably will not change the filter with the next service. KM

 

[butthead]

Cooking and posting mean I do not finish a complete post! Stove is off so.
I figure the most trash found inside a transmission is initial wear hence the filter swap. I also think opponents to flushing see problems relating to ignored service, and consequently fried fluid. They attribute the flush as the problem while I believe the poor maintenance is the source.

Btexpress, yes it is expensive but as I mentioned in another thread I consider my truck a sport car in disguise and treat it as such. I normally put 10k miles on a year, doing as much service DIY as I can. So the cost relative to my F150 is low relatively. The trans service is simply something on the Ecoboost I did not want to do in my 1 car garage. KM

 

[Btexpress]

The Ford service manager where we bought our vehicles told me I didn't need a trans flush. Ever. Which is from Ford, saying trans fluid is a lifetime thing.
I'm sure everyone in these forums will agree that is hogwash. Even synthetic oils have a lifespan.
We did a pan drop and filter change about 100k, 140k on it now. Because we have been towing over 9,000 Mike's per the last 3 years, should do a fluid exchange or pan drop again.
Wish the dang thing had a dipstick!!!😡

 

[EcoXLT]

My 69 Cougar transmission has just over 200k miles on it. I’ve only done pan drop and filter changes.

Bought car in 1976. Trashed it for the first 5 years I owned it. That’s what teenagers did. Then I dragged raced it for about 3 years. Then I got into road track racing for a couple years. Then it sat at my parents house in a garage for years. Then I realized it was a classic car so I slowly started to return it back to OE looking.

Anyways. It has had 3 engines but still the same transmission. (Even original differential that has never had the fluid changed.) But that’s a whole different story. Some pics when I had to change a shifter seal this year. Oil still red.

 

[GearHead_1]

Love that car.

 

[snakebitten]

On topic

 

[Geronimo John]

On topic

SnakeBitten: Ran across the royalty Auto Service video last week. Fully agree with the 30,000 mile between transmission flushes. In fact I had my 2019 F-150 3.5 done at 25,360, as I tow a 6,000 pound RV about 80% of my miles. Mostly out west with mountains.

What's your thoughts on the frequency for such severe service? 25K or 30K?

 

[snakebitten]

SnakeBitten: Ran across the royalty Auto Service video last week. Fully agree with the 30,000 mile between transmission flushes. In fact I had my 2019 F-150 3.5 done at 25,360, as I tow a 6,000 pound RV about 80% of my miles. Mostly out west with mountains.

What's your thoughts on the frequency for such severe service? 25K or 30K?

Hey Geronimo! Good to hear from you sir.

Honestly, as long as you DON'T follow the manufacturer's recommendation to IGNORE your transmission fluid, I don't think there's any meaningful difference between every 25K, 30K, or even 36K.

Although I do admit that if 80% of my miles were towing, my curiosity would have me wanting to see what things look like more often. So shorter frequency.

25,000 miles is seeing the fluid 4 times by the time the truck hit the 100,000 mile mark.

30,000 would be 3 times
36,000 would be 3 times just beyond 100,000

So arguably, any of those frequencies are great.