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Date: Wed, 2 Nov 2005 06:14:10 -0000
From: "John Hudson" <mypcnospam.com>
Subject: Re: Rough Shifting Automatic Trans '98 NG900S


"Malt_Hound" <""Malt_Hound\"nospamm-me not*yahoo.com"> wrote in message news:EoSdnaVu3vGQLvreRVn-qQnospamphia.com... > I have a 98 900S coupe that has an automatic transmission. I purchased > the car used this past summer as a car for my daughter to drive back and > forth to school in. She has a 45 minute urban commute each day from > where she lives to her classes. > > I got the car with just a little over 90k on it and it is in overall > outstanding condition. I went through it entirely upon receipt and > performed all the regular major service items (since I had no idea when > they had last been done) including draining and refilling the > transmission. The condition of the fluid was what would be expected if > it had not been done in a while, but it did not have any serious metal > filings or chunks in it. The drain and fill of the ATF was in an > attempt to smooth the shifting out a bit. > > She racked up 5k miles on it so I already did another oil and filter > change and went ahead and changed the ATF again too. Still no big > improvement. > > From the time that I first drove the car I noticed that the > transmission has a habit of shifting just a bit too hard into the next > higher gear. It isn't horrible just something that concerns me a > little. It does not always shift the same though. Sometimes it shifts > just as you would expect and other times it's too hard. If I run it in > "Sport" mode it seems to shift hard more often. > > I'm just wondering if anyone has any similar experiences with the NG900 > automatic transmission and what the outcome was. I'm also wondering if > there are any decent additives that can be used in that transmission to > smooth out the shifts. I've looked through trhe WIS and do not see > anything as far as adjustments of Service Information Bulletins related > to this unless I'm just missing it... > Fred one assumes knowing your posts that you have filled it correctly. At 90k the box if the car has been driven hard could be on the way out but I hope not. It could possibly be the tie up between the engine ECU and the gearbox ECU, as I believe the throttle is influenced whenever a gear change is made. Can you get a Saab specialist or automatic specialist to advise on this? Wish you luck. (Please advise outcome)

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