Transmission slipping after A/T filter change

[RS Dude]

No offense to anyone, but the argument that not changing the trans fluid in a high mileage trans is totally retarded! Follow the recommended service interval.:faint:

 

[WallyWest]

I've never heard of not changing the trans fluid on a higher mileage transmission for fear it would cause slipping with the new fluid.

I've heard that theory, but I don't buy it for a second.

Trans fluid breaks down eventually, it doesn't lubricate (well) forever. And I would say if the gunk in the fluid is the only thing holding your trans together you're going to be shopping for a new trans in the near future no matter what you do.

 

[T4R2014]

I've heard that theory, but I don't buy it for a second.

Trans fluid breaks down eventually, it doesn't lubricate (well) forever. And I would say if the gunk in the fluid is the only thing holding your trans together you're going to be shopping for a new trans in the near future no matter what you do.

That's kinda the whole idea of the theory. Don't change it, that way you have more time to save up for the new transmission.

 

[tbryanh]

Do job again, but this time use an OEM toyota filter. I have seen comparisons of aftermarket filters that have problems seating correctly to the inlet port of the transmission, allowing air to suck in rather than ATF.

So long as the trans fluid is compatible, it should be fine. I prefer valvoline max life ATF.

But since you mention it slipped right after the filter change, that would be my call.

Just for the record, the trans filter isn't a filter. Its a screen that stops chunks from recirculating. It can't filter effectively simply because its a suction not a pressure port. If the screen was effective it would clog and starve the trans of fluid. There is no reason to ever change that screen. However, if you want a filter, install a Magnefine filter 3/8" port in the cooler line where its actually under pressure to effectively filter the fluid. I swear by them and have one on each of my four vehicles. Also one on the power steering line as well.

Not trying to derail the thread, but on the transmission, do you install the inline filter in the line where the fluid is flowing from the transmission to the cooler, or in the line where the fluid is flowing from the cooler back to the transmission?

Where do you install the filter in the power steering system?

Are the inline filters bypass filters similar to the engine oil filters? In other words, when they plug up, does unfiltered fluid still flow through them?

What are the maintenance intervals for these filters? In other words, how often do you change them?

 

[Drcoffee]

Not trying to derail the thread, but on the transmission, do you install the inline filter in the line where the fluid is flowing from the transmission to the cooler, or in the line where the fluid is flowing from the cooler back to the transmission?

Where do you install the filter in the power steering system?

Are the inline filters bypass filters similar to the engine oil filters? In other words, when they plug up, does unfiltered fluid still flow through them?

What are the maintenance intervals for these filters? In other words, how often do you change them?

I install mine between the cooler and trasmission for two reasons. It catchs any dirt before it reenters the transmission. And it causes a slight back pressure in the coolers to keep the fulid in the coolers longer for better heat transfer.

The magnefine filter has a built in by pass so it wont cause problems if it clogs.

The replacement interval for transnmissions is 30,000 recommended but after opening the last 4 filters up to inspect, I see no reason it cant go 60,000 without any problems. Most of the gunk was stuck to the magnet and the paper filter was fairly clean.

On the steering, i install it before the return to the resevoir. It needs to be in a pressurized line to work properly. Do not put it on the feed side. It will starve the pump of fluid.

Since the PS is nowhere as dirty as the transmission, I consider the filter a single install, life of vehicle filter. It will never clog from steering system use.

 

[WallyWest]

That's kinda the whole idea of the theory. Don't change it, that way you have more time to save up for the new transmission.

Sure, if the transmission is high mileage and slipping, missing shifts, etc... then don't do anything other than shop for a new one. But some people are saying you should never change the fluid in ANY high mileage transmission, ever, regardless of how it's performing. That's the part I disagree with.

 

[jgue467]

...But some people are saying you should never change the fluid in ANY high mileage transmission, ever, regardless of how it's performing. That's the part I disagree with.

I agree, weird theory, same goes for power steering and brake fluids.

I did a full flush/new filter on mine over 100k ago when i bypassed with a cooler and added the magnefine filter and two standard drain/fills since, runs perfect.

Here is the weird part for me, more than one certified mechanic has told me not to change the trans fluids - ever.

Last one is my gf's son, a Cerified BMW tech. He tells me not to change the auto trans fluid on her 06 330ci - ever! (I'm letting it be her call - her car.) On the other hand he does say change its motor oil (w/only castrol a03)/filter (w/only mann brand) at least every 5k, go figure! :cowboy: