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#3073984 - 07/23/13 01:18 PM Changing ATF.
Viscosity Offline


Registered: 07/06/12
Posts: 8
Loc: Tx
I have a 2000 suburban. I have never changed the AT fluid. I have heard over the years that if you wait too long to change it you may as well not change it as when you do, the new fluid will cause problems with the seals. I have no idea whether there is any truth to it or not. Maybe some of you gurus can tell me whether or not there is any merit to this claim.

BTW, I am currently at 170K and having no issues with my transmission.


Edited by Viscosity (07/23/13 01:18 PM)

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#3073988 - 07/23/13 01:24 PM Re: Changing ATF. [Re: Viscosity]
randomhero439 Offline


Registered: 07/21/12
Posts: 1267
Loc: ohio
New fluid will clean all the sludge and varnish out of the transmission. It is very important to change the transmission filter during this process. Lots of high mileage transmissions fail after a fluid change, cause the filter was not changed. The cleaning action clogs the filter and starves the transmission for proper lubrication.

I would change it. But change the filter after you change the fluid.
_________________________
08 335i 6-speed MT: M1 0w-40 / Mann filter (~420whp on E85)
03 Accord V6 6-speed MT: M1 0w-20 / Honda filter~250whp


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#3073991 - 07/23/13 01:26 PM Re: Changing ATF. [Re: randomhero439]
Viscosity Offline


Registered: 07/06/12
Posts: 8
Loc: Tx
Are you saying to change the fluid, let it run for a few days, and then change the filter or just do it all at once.

I had planned to change the filter.

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#3073995 - 07/23/13 01:30 PM Re: Changing ATF. [Re: Viscosity]
randomhero439 Offline


Registered: 07/21/12
Posts: 1267
Loc: ohio
Originally Posted By: Viscosity
Are you saying to change the fluid, let it run for a few days, and then change the filter or just do it all at once.

I had planned to change the filter.


Yeah pretty much what im saying. You could change the filter twice if you'd like, once when you start, then again maybe a week or two later.

IDK how hard it is to change trans fluid on your truck, whatever is feasible for your wallet and time.

Have you done the diff fluid in the truck yet?
_________________________
08 335i 6-speed MT: M1 0w-40 / Mann filter (~420whp on E85)
03 Accord V6 6-speed MT: M1 0w-20 / Honda filter~250whp


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#3074012 - 07/23/13 01:48 PM Re: Changing ATF. [Re: Viscosity]
PhillyJoe Offline


Registered: 03/19/09
Posts: 575
Loc: PA
I would drop & clean the pan, change the filter and refill with Dex VI. Since you are only changing about half the fluid this way, I would do it again in 6 months.

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#3074023 - 07/23/13 01:59 PM Re: Changing ATF. [Re: PhillyJoe]
Donald Offline


Registered: 03/21/04
Posts: 16053
Loc: Upstate NY
Originally Posted By: PhillyJoe
I would drop & clean the pan, change the filter and refill with Dex VI. Since you are only changing about half the fluid this way, I would do it again in 6 months.


This plus installing a $20 Magnefine inline filter to catch all the loosened crud hopefully before it circulates too much.

One thing thing to remember is no flush or chemical can do a good job cleaning the filter. It needs to be replaced. Some like to say they can flush the ATF and by adding a chemical it will clean the filter too.
_________________________
2015 Subaru Forester 2.5 engine/CVT PP & M1
2001 Jeep Grand Cherokee Laredo 4.0 - PP & M1
1999 Dodge Ram 2500 w/Cummins - Rotella T6 & M1


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#3074025 - 07/23/13 02:00 PM Re: Changing ATF. [Re: randomhero439]
NightRiderQ45 Offline


Registered: 03/24/08
Posts: 939
Loc: Houston, TX
Originally Posted By: randomhero439
New fluid will clean all the sludge and varnish out of the transmission. It is very important to change the transmission filter during this process. Lots of high mileage transmissions fail after a fluid change, cause the filter was not changed. The cleaning action clogs the filter and starves the transmission for proper lubrication.

I would change it. But change the filter after you change the fluid.
Baloney!!! This is not true at all. Most modern cars don't have a filter, it's a metal mesh screen that's called a filter.
_________________________
2002 Lexus GS300
1998 FGY33 Infiniti Q45 257k....RIP


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#3074041 - 07/23/13 02:25 PM Re: Changing ATF. [Re: Viscosity]
wirelessF Offline


Registered: 10/04/07
Posts: 1577
Loc: Oahu, Hawaii
In the 4L60E I would recommend changing the filter since its a paper felt type. Since the pan has to be removed to change the fluid (some don't have drain plugs) might as well change the filter and clean out the pan.

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#3074057 - 07/23/13 02:38 PM Re: Changing ATF. [Re: Viscosity]
supton Offline


Registered: 11/09/08
Posts: 7383
Loc: NH
Be thankful you have a dipstick! "Modern" transmissions lack this basic feature. *grumble*
_________________________
2011 Toyota Camry, base, 6spd manual, 107k, hers
2010 Toyota Tundra double cab, 4.6L, auto, 114k, his

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#3074070 - 07/23/13 02:45 PM Re: Changing ATF. [Re: Viscosity]
Kuato Offline


Registered: 10/23/05
Posts: 4477
Loc: 327km N of the other border
Fresh fluid should help preserve your transmission for longer, and a pan drop and refill now, then again in 5-10k miles, then repeat every 30k after that should see you through.
_________________________
Amsoil user.

13 F150, 5.0, 69000km (43k mi)
04 Wrangler, 2.4, 312000km (194k mi)




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#3074146 - 07/23/13 03:59 PM Re: Changing ATF. [Re: randomhero439]
Viscosity Offline


Registered: 07/06/12
Posts: 8
Loc: Tx
Originally Posted By: randomhero439
Have you done the diff fluid in the truck yet?


Nope. I need to do that as well.

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#3074236 - 07/23/13 05:30 PM Re: Changing ATF. [Re: Viscosity]
901Memphis Online   content


Registered: 08/14/10
Posts: 9747
Loc: Northern Kentucky
How does the color look on the dipstick if you blot it on a white towel? Just curious. I recommend Supertech dex 6 at Walmart it's less than $4.50 a quart and pretty good stuff.
_________________________
2002 Buick Century 118k - Built 4T65e - M1 0w40 /Fram Ultra XG 3387A
1998 Nissan Altima 335k - 5MT - M1 HM 5w30/Fram Ultra XG7317

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#3074245 - 07/23/13 05:39 PM Re: Changing ATF. [Re: NightRiderQ45]
RF Overlord Offline


Registered: 11/08/03
Posts: 3481
Loc: Cape Cod, MA
Originally Posted By: NightRiderQ45
Most modern cars don't have a filter, it's a metal mesh screen that's called a filter.
You can't make a blanket statement like that. Ford RWD vehicles with the 4R70W have a regular "media" filter. So does my sister's '08 RAV4...

How come no one ever advises installing a drain plug on transmissions that don't have one? I install them on every car I own and it makes doing regular drain & fills a lot quicker and a LOT less messy.
_________________________
Supercharged '03 Mercury Marauder - Trilogy Motorsports #61
PP 5W-30 / MC FL820S

Y2K Grand Marquis GS - daily driver
QSUD 5W-20 / MC FL820S

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#3074308 - 07/23/13 06:29 PM Re: Changing ATF. [Re: Viscosity]
tommygunn Offline


Registered: 01/27/11
Posts: 3061
Loc: usa
@RF, I always advise to install a drain plug, especially if there is an aftermarket pan with one available.

@OP and everyone else, I guess:
I thought these trucks had a drain plug.

If so, then you don't need to drop the pain. Just drain thru the drain plug.
_________________________
i am a [censored] who hides behind bugmenot.
i also like applying negative pressure to a certain male appendage.

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#3074488 - 07/23/13 10:34 PM Re: Changing ATF. [Re: 901Memphis]
Viscosity Offline


Registered: 07/06/12
Posts: 8
Loc: Tx
I checked it with a white rag and it's reddish in color.

Additionally, there appears to be a drain plug on mine. However, I'm planning on changing the filter so the pan is coming off. Any advice on putting the pan back on. Should I put it back on dry or use a sealant?

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