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Old 01-28-2003, 05:49   #1 (permalink)
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Join Date: May 2002
Location: 8 Mile Plains, Brisbane
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Auto's & line pressure?

Hey guyz, I understand how an auto works but only at a basic shift level. I know there is the sun and planet gears and all that, the bands & solenoids to hold the outer and inner gearings, etc..
But i dont understand this about line pressure? What does fluid pressure have to do with shifting gears? Dont the electric solenoids apply the bands and all?? What does the S5 solenoid do? Can someone please explain this too me?


EB1 3.9L MPI Falcon Wagon with converted T5 / Pacemaker & 2.5" Redback sports exhaust / 2" lowered blocks at the rear, Kings lows up front / ED Tickford Head and Cam / K&N panel filter with XH intake Snorkel / Full EL Fairmont interior with woodgrain

89 EA1 3.9L TBI Falcon Sedan with 3 speed auto / currently being upgraded...
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Old 01-28-2003, 09:12   #2 (permalink)
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S5 controls the signal pressure to the clutch and band regulator and controls the shift pressure. Normally the band and clutch regulators are switched off and full line pressure is applied and pushes oil from S5 between the regulator valve and plunger. Essentially it ensures a smooth rather than jerky gear shift or as the manual say " Converter clutch apply and release feel is made smooth by electronically varying S5 pressure."
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Old 01-28-2003, 12:09   #3 (permalink)
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