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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: 1281
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.
_________________________
'00 S2000: M1 0w-40
'03 Accord V6-6MT: M1EP 0w-20
'10 Mercedes GLK: M1 0w-40
'08 Corvette Z06: M1 5w-30


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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: 1281
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?
_________________________
'00 S2000: M1 0w-40
'03 Accord V6-6MT: M1EP 0w-20
'10 Mercedes GLK: M1 0w-40
'08 Corvette Z06: M1 5w-30


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


Registered: 03/19/09
Posts: 587
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 Online   content


Registered: 03/21/04
Posts: 18205
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
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)


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


Registered: 03/24/08
Posts: 941
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: 1606
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: 10484
Loc: NH
Be thankful you have a dipstick! "Modern" transmissions lack this basic feature. *grumble*
_________________________
2011 Toyota Camry, base, 2.5L/6MT, 130k, hers
2010 Toyota Tundra DC, 4.6L/6AT, 135k, ours
1999 Toyota Camry LE, 2.2L/4AT, 145k, his

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


Registered: 10/23/05
Posts: 6085
Loc: Colorado
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.
_________________________
Oil condition is speculation until a UOA has been performed.

2013 F150 5.0 4x4 60k Schaeffer 9000...Amsoil next

Thick vs Thin test in progress


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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 Offline


Registered: 08/14/10
Posts: 11956
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 125k - Built 4T65e(Maxlife) - Edge 0w40 + Fram XG3980
1998 Nissan Altima 335k - 5MT - M1 HM 5w30/Fram Ultra XG7317+MOS+ATP 205

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


Registered: 11/08/03
Posts: 3654
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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