2010 Santa Fe transmission skipping occasionally - Page 2 - Hyundai Forums : Hyundai Forum
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post #11 of 15 (permalink) Old 04-20-2017, 05:12 PM
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I have done a powerflush some weeks ago and have to say that the gearbox is performing better/smoother. Btw i have a 2007 2.7 4x4 which has run about 120.000 km. They guy who did the powerflush explained that he had similar issues solved as which you described by flushing the gearbox. Main difference with draining and refill is that with powerflush all fluid is flushed out and replaced with new fluid. They keep flushing the gearbox with new fluid until the fluid is bright of color. They also rinse out all the "dirt" while doing this (by adding some additives). I did not have real issues with my gearbox but did the powerflush to make sure i will not run into the same issues you have. Cost of new gearbox is much higher than flushing. Check on youtube some powerflush videos....it convinced me of doing it.
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post #12 of 15 (permalink) Old 04-20-2017, 09:19 PM
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I don't want this thread hijacked but . . .

I was always taught the 'drop pan' method was the best way to change the fluid. Theory: You'll only change ~1/3 quantity so the new fluid mixes with the old fluids and tones down the aggressive detergents in the new fluid. Using all new fluid in a hi-miler slushbox will eventually clean out all the embedded clutch pack fiber that is aiding the soft kit seal off internal leaks and skew port timing. Gradually, the shifts will soften, reverse engagement slows, and then shifts hang.
Hey, one guy swore by reusing the old fluid after filtering it through a pair of his wife's old pantyhose. (OK, OK, OK, enough of the jestings. . .)

But hey, I'm an old school mech and been told theories do change over time.

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post #13 of 15 (permalink) Old 04-21-2017, 10:48 AM
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Dropping the pan will not really result in a more complete flush. Sure, a little more fluid will come out, but the torque convertor will still retain old fluid to dilute the new. What dropping the pan can accomplish is the ability to clean the pan interior of the pan, and I have seen magnets in the pan that can also be cleaned. Will this make much of a difference, probably not. The 3 drain and flushes I usually see recommended should give you the same results.
I had to get a rebuilt transmission in my early 2010 with 50,000 or so miles. Damage was done and the fluid change and software update did not help. Warranty for second owner is only 5 years, but I was fortunate enough that it was covered by the dealerships 60 day used car warranty.
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post #14 of 15 (permalink) Old 04-22-2017, 01:43 PM
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Quote:
Originally Posted by ESully View Post
Dropping the pan will not really result in a more complete flush. Sure, a little more fluid will come out, but the torque convertor will still retain old fluid to dilute the new. What dropping the pan can accomplish is the ability to clean the pan interior of the pan, and I have seen magnets in the pan that can also be cleaned. Will this make much of a difference, probably not. The 3 drain and flushes I usually see recommended should give you the same results.
Not sure if you're responding to my previous post above but... Yes, I agree. ~2/3 of the fluid remains in the internal components and TC, and dropping the pan gains access to the flat filter (and any discarded assembly line hole plugs). My point is that with hi-milers, the new fluid need to be diluted by the remaining to prevent self-induced failure from over-aggressive detergents.
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post #15 of 15 (permalink) Old 04-22-2017, 05:15 PM
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Flat filter?

Commentary regarding new fluid on old transmissions has been around pretty much since they were first introduced. Only if the transmission fluid change has been left until long overdue will this be an issue. The detergent in the new fluid will knock some of the crap off the friction components, which nominally is a GOOD thing, but unless it's been neglected, any resulting debris should never be of a size that could clog a passageway, which is how people have often run into issues after a change. Waiting until the stuff has turned to black peanut butter creates a real problem either way you go -- so just never let anything close to that happen and life will be good.

Another classic source of misinformation on that topic comes from the many anecdotal reports of transmissions crapping out after a change -- when they were about to crap out anyway, were exhibiting symptoms, and the owners had decided to change the fluid in hopes of improving the performance of a transmissions that were already pretty well broken.
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