Since I am not very knowledgeable in the dark matters of automatic transmissions and torque converters, let me see what WIS has to say:

"Improved fuel economy thanks to driving programmes optimizing fuel consumption
as well as lock-up in 3rd, 4th and 5th gears (V6 petrol: 4th and 5th gears only).
Under certain driving conditions when a special gearchange program is active it is
possible to drive in 3rd gear with lock-up instead of 4th gear without lock-up. To
improve fuel economy further, the lock-up clutch is allowed to slip. This means that
a difference of 50 and 200 rpm is permitted between the engine speed and the input
shaft speed. This is only permitted during gentle acceleration. The engine then pulls
for longer in the higher gear before changing down. The slipping lock-up is the main
reason for the choice of a higher grade transmission fluid. If the temperature of the
transmission fluid rises, a temperature-dependent program is automatically selected,
protecting the gearbox from heat damage. Refer to Special gearchange programs."

"Special gearchange programs are selected automatically depending on the engine load. This
function is available to normal and sport programs.
The shifts occur at higher engine rpm and the gear is engaged for longer if the control module
senses that the load does not decrease. These shifting programs are in place to avoid
unnecessary up and downshifting, for example, when driving on long uphill stretches with a
trailer as well as to prevent overheating of the transmission fluid.
The special gearchange programs are not activated at speeds above 150 km/h. If a special
gearchange program is active when the vehicle accelerates beyond 150 km/h, the program is
retained until the control module senses that a more suitable gearchange pattern can be
selected."

Was that any helpful?

2000 SE V6 Wagon 102k

posted by 128.143.254...

• Transmission strangeness, Stephen Goldberger, Wed, 30 Apr 2008 17:23:16
  • Slipping lock-up clutch?, Marcin, Thu, 1 May 2008 10:25:43 <-- Viewing This Message
    • Thanks, Stephen Goldberger, Fri, 2 May 2008 15:02:03
      • Re: Boost is boost the purpose of a supercharger or a, Jay son, Fri, 2 May 2008 19:27:26
        • Clarification..., Larry West , Fri, 2 May 2008 22:40:39
  • Re: Transmission strangeness, johnl, Thu, 1 May 2008 04:34:37
    • Never ever a transmission overtemp light., Stephen Goldberger, Thu, 1 May 2008 06:06:28
  • 1,800kg per Saab UK site, steve, Thu, 1 May 2008 03:02:47
    • Re: 1,800kg per Saab UK site, Stephen Goldberger, Thu, 1 May 2008 06:14:20
  • Re: Transmission strangeness, MikeN, Wed, 30 Apr 2008 21:30:44
  • Re: Transmission strangeness- I think you are pushing, Jay Son, Wed, 30 Apr 2008 20:20:55

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