Adjustable Vacuum Modulator For GM TH350 And TH400 Transmissions, Fully Tune Your Shift Points From Two To Four MPH, Pre Adjusted For Normal Points, Genuine BM Accessory, 1 Year Warranty

Adjustable vacuum modulator for GM TH350/TH400
✔️ Single unit, adjustable 2-4 mph shift points, pre-adjusted

This adjustable vacuum modulator is designed for GM TH350 and TH400 transmissions and is typically used in classic GM cars and trucks to fine-tune shift timing for smoother driving. It ships as a single unit and is backed by a 1-year limited warranty.

✅ Fully adjustable 2-4 mph range
✅ Pre-adjusted for normal shift points to get you started
✅ Genuine B&M accessory for reliable performance
✅ 1 year warranty backed by the manufacturer

💡 What is an adjustable vacuum modulator used for in GM transmissions?

Here's a handy overview to help you decide if this part fits your setup.

- It lets you fine-tune shift points in GM TH350 and TH400 automatics - It works within a 2-4 mph adjustment range for precise timing - Pre-adjusted for easy installation and predictable performance - Backed by a 1-year warranty for peace of mind