Skip to main content
ASK OUR EXPERTS
1-866-464-6553

B&M Transpak - GM TH400/375 Transmissions

1965-1987 GM TH400/375 Automatic Transmissions.

Part # 20228 Be the first to write a review

B&M Transpak - GM TH400/375 Transmissions

In Stock
Free Shipping - Lower 48 US States
$128.95
Add to Wishlist
5

Emissions

This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.

See Emissions Details
The B&M® Transpak is the next step up from the B&M Shift Improver kit. It has all the features in the Shift Improver kit, plus it provides additional driver manual control (GM TH-400, 350, Ford C-6 and Chrysler Torqueflite only). B&M® Transpak™ kit for 1965-1987 GM TH400/375 automatic transmissions. Most stock automatic transmissions won't downshift into low gear above 15 mph, and automatically upshift at a predetermined speed no matter what gear you're in. With the Transpak, you can downshift at any speed, and you can hold the transmission in first gear to any speed that you want! This is an asset when you've got a modified engine, and you want additional RPMs, or you're towing a trailer or driving heavy loads downhill. Stage 1. Heavy Duty is for street rods, normal passenger vehicles or other heavy duty use. Firmer shift feel but not harsh. Improves transmission performance and life dramatically without loss of comfort and offers normal automatic operation when in Drive. Stage 2 is for Hi-Performance street use. Essentially the same as Heavy Duty mode except shifts are much quicker. Retains full automatic features and standard shift points with selector in Drive.

Features:

  • Recalibrate's GM TH400 Automatic Transmissions
  • Full Manual Control on Most Transmissions
  • Over 65 Years of B&M Quality
  • Improves Transmission Life
  • Optimum Performance
  • Firmer Shifts

About B&M

Shop B&M's official site for automatic shifters, transmissions and components that exceed all your performance enthusiast needs at Holley.com!

Automotive Item GradeHigh Performance
Brand B&M
Emission Code5
Gasket IncludedYes
Instructions IncludedYes
Manual ControlPartial
Product TypeAutomatic Transmission Valve Body Kit
UPC019695202286
California Proposition 65 Chemical NameCadmium and cadmium compounds
California Proposition 65 RequiredYes
Part Number20228
5

This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.
  • Gaskets
  • Drill Bits
  • Seals
  • Retaining Ring
  • Brass Plug
  • Shift Valve
Fits 1965-1987 GM Turbo-Hydramatic 400, Turbo-Hydramatic 375 automatic transmissions.
Reviews

    Your Review

    *Free Shipping & Handling only offered to the contiguous US on orders over $149, excludes clearance parts and oversized packages.

    Some parts are not legal for use in California or other states with similar regulations.