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subaru transmission problems

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

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What is this discussion about? Subaru Forester, Transmission, Wagon

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#68 of 71 Re: transmission problem [frbock1] by wolfdoug Aug 17, 2009 (2:40 pm)
Replying to: frbock1 (Aug 17, 2009 2:25 pm) Mine's not making noise - just shifting a little hard (when cold,mostly). I will try a transmission service first. - Soon.
#69 of 71 Re: Subaru transmission won't shift [bigfrank3] by aatherton Aug 19, 2009 (6:24 am)
Replying to: bigfrank3 (Jul 14, 2009 10:26 am) "... this occurs it is because of the trans filter needing replacing. As the filter gets "used" and partially restrictive the hydraulic pressure to initiate the shift is lacking..."   This does not help his 2007 Forester, but Subaru eliminated the transmission filter on the 2008 models, beginning in mid-year 2007. For 2008 they blanked off the filter opening with a wide threaded plug, and for 2009 the opening was cast closed.   It does seem amazing that the transmission could generate enough debris to clog the big filter and affect shifting. Now there is no filtering at all. Since the AT filter was "lifetime", perhaps there is really too little stuff to be worth filtering, too little stuff to ever clog the filter, and no real need for the filter.   I guess between Jiffy Lube mistaking the AT filter for the oil filter, and the shifting problems you attribute to the AT filter, Subaru decided it only caused trouble. Replies to this message: bigfrank3 (Aug 19, 2009 9:22 am) aatherton (Sep 14, 2009 4:09 am)
#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.

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