subaru transmission problems

71 messages, Last post on Sep 14, 2009 at 4:09 AM

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#70 of 71 Re: Subaru transmission won't shift [aatherton] by bigfrank3 Aug 19, 2009 (9:22 am)
Replying to: aatherton (Aug 19, 2009 6:24 am) That's interesting. I wonder if they went to an internal filter as other manufacturers? I have pulled down many trans pans (not Subaru) and every one of them had lots of crap in the bottom and on the filter/screen. They weren't all high mileage either. The friction caused by clutches and bands causes a lot of stuff to sluff off into the fluid. The passages and orifices for the hydraulic fluid are quite small and it doesn't take much to cause issues. A single fiber between a check-ball and its seat would cause problems. I find it really hard to believe that they wouldn't use SOME filter somewhere, and Subaru should not be immune to the reality of wear and the issues it causes. Replies to this message: aatherton (Sep 14, 2009 4:09 am)
#71 of 71 Re: Subaru transmission won't shift [bigfrank3] by aatherton Sep 14, 2009 (4:09 am)
Replying to: bigfrank3 (Aug 19, 2009 9:22 am) > ... I wonder if they went to an internal filter as other manufacturers? > I have pulled down many trans pans (not Subaru) and every one of them > had lots of crap in the bottom and on the filter/screen. No doubt the Subaru transmission always has had an internal screen like other cars. But the unique discontinued external pleated paper filter was much finer.

#70 of 71: Re: Subaru transmission won't shift [aatherton] by bigfrank3; Aug 19, 2009 (9:22 am)

Replying to: aatherton (Aug 19, 2009 6:24 am)

That's interesting. I wonder if they went to an internal filter as other manufacturers? I have pulled down many trans pans (not Subaru) and every one of them had lots of crap in the bottom and on the filter/screen. They weren't all high mileage either.

The friction caused by clutches and bands causes a lot of stuff to sluff off into the fluid. The passages and orifices for the hydraulic fluid are quite small and it doesn't take much to cause issues. A single fiber between a check-ball and its seat would cause problems. I find it really hard to believe that they wouldn't use SOME filter somewhere, and Subaru should not be immune to the reality of wear and the issues it causes.

aatherton (Sep 14, 2009 4:09 am)

#71 of 71: Re: Subaru transmission won't shift [bigfrank3] by aatherton; Sep 14, 2009 (4:09 am)

Replying to: bigfrank3 (Aug 19, 2009 9:22 am)

> ... I wonder if they went to an internal filter as other manufacturers?
> I have pulled down many trans pans (not Subaru) and every one of them
> had lots of crap in the bottom and on the filter/screen.

No doubt the Subaru transmission always has had an internal screen like other cars. But the unique discontinued external pleated paper filter was much finer.