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Old 02-24-2004, 06:28 AM
Nobody Nobody is offline
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ATF flush vs. drain

Hi all, I need little help from you. Maybe I did not feel exact difference between flush and drain. My tranny was rebuilt couple months ago but was filled up with some Valvoline semi-synthetic ATF insted of Mobile 1 I wanted and insisted (you know some mechanics are silly :-((() It has some 2000 kms on it but I will want definitely switch to fully synthetic. So question is what is RIGHT procedure for me? Just to let drain it out and fill it with synthetic? Or what exactly mean FLUSH. Thanx for help.
Peter
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Old 02-24-2004, 07:58 PM
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Subafreak Subafreak is offline
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By just draining the fluid yoy only change about 1/3 of it. You only change whats in the pan, but most of the fluid is still in the lines, cooler, valves, and tourq converter. So flushing is always the best way to go especially if changing fluid types.
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Old 02-25-2004, 12:27 AM
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OK so what is the right procedure?
Peter
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Old 02-25-2004, 06:14 PM
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Do the flush!
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92 SVX #772 140k 6speed, ECU Tune stage II, Koni/Ground control, 3,270lbs.
91 Legacy Turbo 5spd. FMIC, crappy stock turbo, ACT clutch.
78 BRAT (New toy) (Soon to be EJ22T powered)
90 240 SX. RB25 powered!! DRIFT!!!111!!! (GF's car)

To many cars to spend time on teh web!
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Old 02-25-2004, 07:19 PM
tmaslar
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How exactly do you perform the flush?
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Old 02-25-2004, 09:46 PM
mark10t
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Quote:
Originally posted by tmaslar
How exactly do you perform the flush?
Well, on most toilets there is usually a little silver handle you flip down....................

-Mark

(I just couldn't resist!)

(always the smart a$$......... )
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  #7  
Old 02-25-2004, 11:25 PM
gl1674 gl1674 is offline
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Quote:
some Valvoline semi-synthetic ATF
Good stuff. Keep it for now. Change annually with the same stuff. Been using it for the last 5 years/70k miles, 0 transmission rebuilds, 0 wheel bearings, one Duty Solenoid A, one jumped timing belt.
Definitely helped the wheel bearings :-)

If you just drain the ATF from the sump, you get of ATF 1/3 out.
If you drop the sump and pull a line that begs to be pulled,
you get another 1/3 of ATF out in an hour or so (drips slowly).

The flush is different from the drain because with flush they disconnect the cooler line, let the discharge line drain and feed the new ATF into return line to transmission. They promise to replace all ATF, but the catch is, you can't drain all old ATF first and fill new next, you can't leave running transmission empty. You have to actually supply new ATF while the old one is draining. The new and old ones mix in the process. Flush is more expensive then drain, but I'm not sure you achieve more than 2/3 of ATF replacement with it.
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