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#4456678 - 07/11/17 08:25 PM Trans Magnet
Plimbob Offline


Registered: 04/20/17
Posts: 11
Loc: Iowa
I am going to be changing out ATF on my 07 Tahoe and have heard that the magnets in these are weak?

Anyone have experience with these and if so suggest a strong replacement?

Thanks,
Tim

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#4456688 - 07/11/17 08:30 PM Re: Trans Magnet [Re: Plimbob]
TheKracken Offline


Registered: 04/18/17
Posts: 515
Loc: Fort Worth TX
Have you considered running an inline trans magnetic filter? Pretty easy to do.
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#4456719 - 07/11/17 08:48 PM Re: Trans Magnet [Re: Plimbob]
barkingspider Offline


Registered: 12/22/13
Posts: 2040
Loc: socal
I never had any issues in my GM trucks w just the stock trans magnet. They work good because every time I dropped a pan, the magnet had some metal fuzz on them. You can always add another one in the pan if you feel it necessary. Just make sure it's thin so that it doesn't contact the trans.
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#4456722 - 07/11/17 08:50 PM Re: Trans Magnet [Re: Plimbob]
Dyusik Offline


Registered: 09/26/14
Posts: 1978
Loc: US-WA
Neodymium magnets can be bought on eBay, a bitty thing half the size of your fist will have 100lb rated magnetic pull. I'd use that in something with no drain plug.
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#4456726 - 07/11/17 08:52 PM Re: Trans Magnet [Re: Plimbob]
rotorcraft230 Offline


Registered: 03/07/17
Posts: 28
Loc: Brazoria County Texas

http://www.drainplugmagnets.com/

Sorry dosen't look like they are available for your vehicle. Nice plugs though.


Edited by rotorcraft230 (07/11/17 08:59 PM)
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#4456733 - 07/11/17 08:58 PM Re: Trans Magnet [Re: Plimbob]
Kibitoshin Offline


Registered: 04/19/16
Posts: 688
Loc: Kaiōshinkai
Those donut magnets at any hardware store works well. There was a GM TSB where the original square magnet didn't have enough holding capacity so they advise replacing it with a donut magnet in place of the square magnet.

Using the magnets from a couple of old hard drives work extremely well too. They are strong neodymium magnets so they work well just sticking them outside of the pan. Makes cleaning the fuzzies off the pan easier too.
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#4456956 - 07/12/17 07:25 AM Re: Trans Magnet [Re: Dyusik]
Donald Offline


Registered: 03/21/04
Posts: 20446
Loc: Upstate NY
Originally Posted By: Dyusik
Neodymium magnets can be bought on eBay, a bitty thing half the size of your fist will have 100lb rated magnetic pull. I'd use that in something with no drain plug.


With no drain plug the ATF is likely to drain out unless the magnet is do strong it will prevent that??
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#4456961 - 07/12/17 07:27 AM Re: Trans Magnet [Re: Plimbob]
Donald Offline


Registered: 03/21/04
Posts: 20446
Loc: Upstate NY
I still suggest a Magnefine inline filter as the ATF is forced to flow right past the magnet and it's got a 30 micron media filter.
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#4456972 - 07/12/17 07:45 AM Re: Trans Magnet [Re: Plimbob]
JustN89 Offline


Registered: 06/27/17
Posts: 459
Loc: DFW
Yes, GM issued a TSB which called for replacing the rectangular magnets with new, circular magnets.

http://www.rockauto.com/en/catalog/chevrolet,2007,tahoe,5.3l+v8,1433255,transmission-automatic,oil+pan+magnet,18538

There's the link to the new magnet they are recommending now. I don't know if you have the 4.8L or 5.3L, but the magnet is the same.

I also second the Magnefine inline filter.

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#4457015 - 07/12/17 08:40 AM Re: Trans Magnet [Re: Plimbob]
Plimbob Offline


Registered: 04/20/17
Posts: 11
Loc: Iowa
Thanks guys for all the input on this, I'll take a look at the Magnefine filter.

Another quick question, is there an additive that you all would suggest to add to the replacement.

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#4457021 - 07/12/17 08:45 AM Re: Trans Magnet [Re: Plimbob]
JustN89 Offline


Registered: 06/27/17
Posts: 459
Loc: DFW
Lubegard Red has some pretty positive reviews on here in these GM transmissions. I have added it to my 4T65E transmission to help keep temps under control and it seems to have some effect. It's still too early to tell as I've only put a couple hundred miles on the transmission since I added it, but I've got no complaints thus far.

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#4457039 - 07/12/17 09:02 AM Re: Trans Magnet [Re: Plimbob]
khittner Offline


Registered: 07/13/12
Posts: 301
Loc: Michigan
No additive needed. Use a good synthetic ATF, like MaxLife.

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#4457149 - 07/12/17 11:02 AM Re: Trans Magnet [Re: Dyusik]
Kestas Online   content



Registered: 06/04/02
Posts: 12323
Loc: The Motor City
Originally Posted By: Dyusik
Neodymium magnets can be bought on eBay, a bitty thing half the size of your fist will have 100lb rated magnetic pull. I'd use that in something with no drain plug.

Careful going overboard with magnets and where you place them. You don't want them to interfere with the solenoids.

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#4457150 - 07/12/17 11:04 AM Re: Trans Magnet [Re: Plimbob]
i_hate_autofraud Offline


Registered: 05/19/16
Posts: 704
Loc: Canada
Google "4T65E magnet" it'll lead you to a GM doc that list several trannies using terrible weak square magnets.

NEVER put a magnet on the outside of the tranny oil pan. Why? The pan is .040 to .075" thick steel where most of the magnet's field is shunted by the thick metal, meaning it'll do little good inside the pan. On spin-on engine oil filters with steel only .010 to .020" thick they work great, because the steel is thin, as an example.

Dropping the pan and finding places with enough clearance to tranny parts and then placing magnets inside is way better! I've placed as many as 6 mags inside and it's way better then cutting a cooler line for an inline filter. Why? inside the pan magnets are exposed to a much larger flow of ATF then what goes thru the cooler line alone.

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#4457154 - 07/12/17 11:08 AM Re: Trans Magnet [Re: Plimbob]
Lubener Offline


Registered: 01/22/11
Posts: 2576
Loc: N.Ohio
Originally Posted By: Plimbob
I am going to be changing out ATF on my 07 Tahoe and have heard that the magnets in these are weak?

Anyone have experience with these and if so suggest a strong replacement?

Thanks,
Tim


Check out the TSB, you will need two magnets. You have very little pan clearance so I would go with the GM ones stated in the bulletin. Rock Auto has them. These things are very strong so you don't need to play guess work finding something to fit.

TSB # 08-07-30-040B


Edited by Lubener (07/12/17 11:09 AM)
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