b&m
B&M 20234 Vacuum Modulator
- SKU:
- 19748657
- MPN:
- 20234_100
- Availability:
- Usually ships the same or next business day. In stock at our CA, FL, GA, KS, MI, PA, TX, WA warehouses.
- Shipping:
- Calculated at Checkout
- Stock Update:
- 08/28/2026 11:14:29 AM PST
Bulk discount rates
Below are the available bulk discount rates for each individual item when you purchase a certain amount
| Buy 2 | and pay only $58.91 each 58.91 |
| Buy 3 - 4 | and pay only $54.61 each 54.61 |
| Buy 5 - 9 | and pay only $53.49 each 53.49 |
| Buy 10 or above | and pay only $52.65 each 52.65 |
- Stock Update:
- 08/28/2026 11:14:29 AM PST
Frequently bought together:
Description
This item is brand-new, factory sealed.
B&M 20234 Adjustable Vacuum Modulator- Vacuum modulator is fully adjustable to custom tailor your shift points (within 2-4 mph)
- Comes pre-adjusted for normal shift points to get you started
- Applications include GM TH350 and TH400 transmissions
- Genuine B&M accessory
- Backed by the manufacturer with a 1 year limited warranty
- Manufacturer: ?B&M
- Brand: ?B&M
- Item Weight: ?1.6 ounces
- Item model number: ?20234
- Is Discontinued By Manufacturer: ?No
- Exterior: ?Gold Iridite
- Manufacturer Part Number: ?20234
- OEM Part Number: ?20234
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.
Warranty Information
All Items are Brand New, Factory Sealed and come with a standard warranty. [Read our policies]
View AllClose
B&M 20234 Vacuum Modulator
$63.26