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On 18 Feb 2004 at 17:08, Gamboa, Gary wrote: > do you mean the vaccum unit that controls the primary throttle pressure > on page 9 of Automatic Transmission chapter? If so, I thought this was > only for the speed at which shits occur, not while under load/inclines. Yes, sorry. See also page 10. It controls the interplay between shift speed and load. It senses load by means of the manifold vacuum, and changes the shift point accordingly: If you have your foot farther down you'll have less manifold vacuum (greater absolute pressure) and the AT will stay in the low gears longer. -- ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org