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B&M 20234 Adjustable Vacuum Modulator

(812 Reviews)
Price
$23.92
Quantity
(10000 available )
Total Price
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18 Ratings
16
2
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Reviews

  • Donald R. Woods SR.

    Greater than one week

    easy installation, works great

  • Nunya

    > 3 day

    My TH400 in my classic Jeep was shifting to early. I replaced this and used the screw to adjust this shift point to get the later shift I was desiring. Worked perfectly.

  • Stone

    > 3 day

    It worked as advertised.

  • Maddog

    > 3 day

    Great

  • Brad A

    > 3 day

    Fit perfect and works awesome to firm up the shifts on my 1975 jeep wagoneer with a th400 transmission. The factory setting on this is really close to what I️ wanted but I️ took it in two more turns to get it to hold the gears for a bit longer. Very, very happy with it.

  • Charlie swoboda

    09-06-2025

    Easy to adjust and let me set the shifting where I wanted it

  • nancy merchant

    > 3 day

    easy install

  • Boom

    Greater than one week

    Exactly as described. Fit perfect and installed easy.

B&M accessories help you complete your project with parts designed and selected by the experts at B&M. This vacuum modulator comes pre-adjusted for "normal" shift points, but it is fully adjustable, allowing you to customize the shift points (within a range of 2-4 mph). This unit is designed for use with select applications, including GM TH400 and TH350 transmissions. Please note: If you have a big camshaft and your engine does not make adequate vacuum, you will not be able to make the stock or B&M modulator work properly, usually resulting in late, hard shifts.

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