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Trans Magnet #4456678
07/11/17 08:25 PM
07/11/17 08:25 PM
Joined: Apr 2017
Posts: 20
Iowa
Plimbob Offline OP
Plimbob  Offline OP

Joined: Apr 2017
Posts: 20
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

Re: Trans Magnet [Re: Plimbob] #4456688
07/11/17 08:30 PM
07/11/17 08:30 PM
Joined: Apr 2017
Posts: 515
Fort Worth TX
TheKracken Offline
TheKracken  Offline

Joined: Apr 2017
Posts: 515
Fort Worth TX
Have you considered running an inline trans magnetic filter? Pretty easy to do.


2011 Prius 96k miles RLI 5w20
97 Toy T100 4x4: amsoil 0w20 242k Miles
04 Toy Sienna awd: Pennzoil 0w20 281k Miles
Re: Trans Magnet [Re: Plimbob] #4456719
07/11/17 08:48 PM
07/11/17 08:48 PM
Joined: Dec 2013
Posts: 2,099
socal
barkingspider Offline
barkingspider  Offline

Joined: Dec 2013
Posts: 2,099
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.


06 Cadillac Escalade Ext
17 Cadillac ATS (wife)
05 Toyota Camry (daughter)
11 GMC Canyon off-road (daily)
Re: Trans Magnet [Re: Plimbob] #4456722
07/11/17 08:50 PM
07/11/17 08:50 PM
Joined: Sep 2014
Posts: 2,205
US-WA
Dyusik Offline
Dyusik  Offline

Joined: Sep 2014
Posts: 2,205
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.


95 Cherokee 190K DELO 10W30, XG8
07 IS250 106K STP syn HM 10w30, FULL
04 YZF-R1 19K DELO 15w40, XG7317
99 HD XL1200S 21K VR1 20w50, NG1515
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Re: Trans Magnet [Re: Plimbob] #4456726
07/11/17 08:52 PM
07/11/17 08:52 PM
Joined: Mar 2017
Posts: 32
Brazoria County Texas
rotorcraft230 Offline
rotorcraft230  Offline

Joined: Mar 2017
Posts: 32
Brazoria County Texas

http://www.drainplugmagnets.com/

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

Last edited by rotorcraft230; 07/11/17 08:59 PM.

06 Silverado 267,000 Val HM 5W-30 DD
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Re: Trans Magnet [Re: Plimbob] #4456733
07/11/17 08:58 PM
07/11/17 08:58 PM
Joined: Apr 2016
Posts: 815
Specific Ocean
Kibitoshin Offline
Kibitoshin  Offline

Joined: Apr 2016
Posts: 815
Specific Ocean
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.


Shin Gekiretsu Shin'ou'hou
01 Toyota Tundra 2WD V8 4.7L
02 Chevy Silverado C1500 V8 5.3L
Re: Trans Magnet [Re: Dyusik] #4456956
07/12/17 07:25 AM
07/12/17 07:25 AM
Joined: Mar 2004
Posts: 21,834
Upstate NY
Donald Offline
Donald  Offline

Joined: Mar 2004
Posts: 21,834
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??


2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: Trans Magnet [Re: Plimbob] #4456961
07/12/17 07:27 AM
07/12/17 07:27 AM
Joined: Mar 2004
Posts: 21,834
Upstate NY
Donald Offline
Donald  Offline

Joined: Mar 2004
Posts: 21,834
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.


2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: Trans Magnet [Re: Plimbob] #4456972
07/12/17 07:45 AM
07/12/17 07:45 AM
Joined: Jun 2017
Posts: 733
DFW
JustN89 Offline
JustN89  Offline

Joined: Jun 2017
Posts: 733
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.

Re: Trans Magnet [Re: Plimbob] #4457015
07/12/17 08:40 AM
07/12/17 08:40 AM
Joined: Apr 2017
Posts: 20
Iowa
Plimbob Offline OP
Plimbob  Offline OP

Joined: Apr 2017
Posts: 20
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.

Re: Trans Magnet [Re: Plimbob] #4457021
07/12/17 08:45 AM
07/12/17 08:45 AM
Joined: Jun 2017
Posts: 733
DFW
JustN89 Offline
JustN89  Offline

Joined: Jun 2017
Posts: 733
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.

Re: Trans Magnet [Re: Plimbob] #4457039
07/12/17 09:02 AM
07/12/17 09:02 AM
Joined: Jul 2012
Posts: 417
Michigan
khittner Offline
khittner  Offline

Joined: Jul 2012
Posts: 417
Michigan
No additive needed. Use a good synthetic ATF, like MaxLife.

Re: Trans Magnet [Re: Dyusik] #4457149
07/12/17 11:02 AM
07/12/17 11:02 AM
Joined: Jun 2002
Posts: 12,882
The Motor City
Kestas Offline
Global Moderator
Kestas  Offline
Global Moderator

Joined: Jun 2002
Posts: 12,882
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.

Re: Trans Magnet [Re: Plimbob] #4457150
07/12/17 11:04 AM
07/12/17 11:04 AM
Joined: May 2016
Posts: 725
Canada
i_hate_autofraud Offline
i_hate_autofraud  Offline

Joined: May 2016
Posts: 725
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.

Re: Trans Magnet [Re: Plimbob] #4457154
07/12/17 11:08 AM
07/12/17 11:08 AM
Joined: Jan 2011
Posts: 2,938
N.Ohio
Lubener Offline
Lubener  Offline

Joined: Jan 2011
Posts: 2,938
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

Last edited by Lubener; 07/12/17 11:09 AM.

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