Replacing trans filter - is it really necessary?

[Kestas]

For all the years I've replaced transmission fluid, I have yet to see a filthy transmission filter. Is it really necessary to replace it each service? Sometimes it seems like a waste. I mean other than the first time to get rid of the break-in and factory material, does it really need to be changed each time? Unlike oil filters, the filter media for transmissions seems rather porous. Isn't it enough just to clean the magnet and exchange the fluid?

 

[rpn453]

I agree that it probably isn't necessary, but it costs almost nothing and is changed so infrequently I do it anyway. Besides, the kit with the new gasket comes with a filter (unless you make your own with RTV, but I prefer a pre-made gasket myself).

[ September 15, 2003, 02:12 PM: Message edited by: rpn453 ]

 

[timzak]

At about $30 for a filter/gasket kit, it doesn't cost much when amortized over the 30K miles you'll be running it. I do it for peace of mind, even if the old filter might not look dirty.

 

[unDummy]

I run most of my transmission filters 100k miles or more. Because of regular flushes(drain/refills)and synthetic ATF, I've never run across a dirty filter in any of my cars.

Most filters, IMO, last 100k miles. If maintenance is lacking, then change immediately, inspect filter contents, clean the pan and magnets, and start a schedule from that point on.

 

[Mike_dup1]

Change the filter, its there to be a safeguard for the trans. Just because you can't see anything does not mean its not contaminate with small metal particles etc.

 

[unDummy]

You can SEE if the filter is a lame metallic screen or even worse, a plastic mesh.

He didn't mention the application.

Even some of the better fiber type filters aren't anything to brag about. The media comes apart easily and visual inspection is plenty.

Only the oil filter type ATF filters catch small particles. Most OEM ATF filters are a joke!

Magnets do more filtering than the screens.

 

[JTK]

I agree with Mike. If anything, you want to pull the AT pan by 50Kmi anyway to give it a good cleaning. May as well change out the AT filter then. If AT has a serviceable pan, it's got a filter/screen. Some of the new transaxles dont have a pan or filter anymore (some honda's)

Joel

 

[Ray H]

And then there are the transmissions that use split cases, no filters, and no pan... Just a magnetic drain plug screwed into the aluminum case. That's fine for ferrous metals and chrome, but what about aluminum and bronze particles? What about friction facing material that's flaked off?