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B&M Adjustable Modulator - GM TH350/TH400 Automatic Transmissions - 20234 power-steering-rack-pinion-lines 4L V8 1969 - 1970Overview: The B&M vacuum modulator is fully adjustable and allows you to fine tune your shift points and shift feel. This is done by turning the adjustment screw inside of the vacuum line connection for more or less diaphragm preload, thus raising or lowering part throttle shift points and line pressures. For GM TH350 and TH400 automatic transmissions. Features: Allows you to Tailor Shift Points New O ring Helps Stop Leaks Fully Adjustable B&M Quality