Moderate — 2–4 hours
Description
Fitment
Fitment Guaranteed
Don’t gamble
on fit.
Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.
Available on iOS & Android
Specifications
| Brand | B&M |
| Part Number | B00M 20229 |
Videos
Turbo-Hydro 400 TRANSGO Shift kit install part 2 with Road Test
Install: B&M Vacuum Modulator for GM TH350 & TH400 Automatic Transmissions 20234
TH400 Torque Converter Install (Made EASY)
GM TH400 Automatic Transmission Rebuild For Dummies
Rebuilding the GM Turbo 400 TH400
4L80E Vs TH400: Which One Do you Choose?
Here Is Why People Blow Up Their TH400 Transmission - Follow These Few Tips To Help Avoid That
How to Install your Converter the Right Way!
Turbo 400 Vacuum Modulator Adjustment Explained And Test Drive
Lokar Anchor-Tight Locking Flexible Trans Dipstick Install TH400
Shifting issues on a TH400 Transmission
Buy with Confidence
Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
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