As far as I'm aware the vacuum amplifier (blue flying saucer) varies the vacuum being fed to the transmission modulator based on boost levels. This would allow the transmission to firm up the shifts under boost (more power being produced) and reduce slip\wear.

__________________
2004 F150 4.6L -My Daily
2007 Volvo XC70 -Wife's Daily
1998 Ford F150 -Rear ended
1989 J-spec 420SEL -passed onto its new keeper
1982 BMW 733i -fixed and traded for the 420SEL
2003 Volvo V70 5 Speed -scrapped
1997 E290 Turbo Diesel Wagon -traded for above
1992 BMW 525i -traded in
1990 Silver 300TE -hated the M103
1985 Grey 380SE Diesel Conversion, 2.47 rear end, ABS -Sold, really should have kept this one
1979 Silver 300D "The Silver Slug" -Sold

Interesting...so the boost signal overrides all or part of the throttle position signal to vary the amount of modulation to the transmission.

I was running the blue-flying-saucer setup with my replacement 722.3x tranny for awhile and there was no discernible difference when I unhooked it and went with the "stock" 722.3x setup with just the VCV controlling modulation. I would take this to mean that the modulation curve on the 722.4x transmission is different allowing it to take advantage of the "vacuum amplifier" function.

Thanks

__________________
Current Stable

• 380SL (diesel)
• Corvette C5
• Manx
• Baja Bug
• F350 Powerstroke
• Auburn Boattail Speedster replica