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Old 08-18-2002, 04:13 PM   #1
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Join Date: Jan 2001
Location: Ft. Worth, TX
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Car: 89 Turbo Trans Am and lots of non-3rd gens
Engine: 231 SFI Turbo's, LT4, LT1
Transmission: 2004r, 4L60E

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Programming 4L60E, what does the Main Line Pressure settings do?
There is a table in the eprom for "Main Line Pressure" on the 4L60E and it is mph vs TPS%. What does this control, and what does raising the values do and for drivability, and is it a good or bad idea to raise these slightly?
Thanks
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Old 08-18-2002, 05:58 PM   #2
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IMO, leave all pressure controls alone! If you want to change shift points, fine but don't mess with the pressure controls. Get a TransGo Reprogramming Kit and allow IT to take care of the Pressure control. Another option is the TransGo Vacuum Controlled Pressure SYstem. THis way no "glitch" will affect the Tranny.
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Old 08-18-2002, 05:58 PM
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