B&M Shift Improver Kit - GM TH400 Transmissions

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Part Number
B&M 20260

The B&M® Shift Improver kits™ feature two options to recalibrating your 1965-1987 GM TH400, TH375 and TH475 automatic transmissions. First is the HEAVY DUTY set-up, giving you firm positive shifts without loss of driver comfort for improved performance in all street vehicles. This is a great option for performance street driving or towing. The second is our STREET/STRIP set-up. Be warned, this will deliver firm positive shifts you will feel, along with easily chirping the tires when shifting somewhat aggressively. This setting is recommend for high performance street/strip use, or for competitive events when you want the hardest, quickest shifts possible from a shift improver kit.

  • Perfect for Towing or Street/Strip Use
  • Eliminates Soft and Sluggish Shift
  • Recalibrates Stock Transmissions
  • Over 65 Years of B&M Quality
  • Eliminates Shift Overlap
  • Provides Crisp Shifts
More Information
Part NumberB&M 20260
Manufacturer Part Number20260
UPC19695202606
BrandB&M
Emission Code5
Part TypeAutomatic Transmission Valve Body Kit
Typeproduct
Item ReturnsThis item can be returned

Automotive Item GradeHigh Performance
BrandB&M
California Proposition 65 Chemical NameCadmium and cadmium compounds
California Proposition 65 RequiredYes
Emission Code5
Gasket IncludedYes
Instructions IncludedYes
Manual ControlNo
Product TypeAutomatic Transmission Valve Body Kit
WarningCalifornia Proposition 65

  • Gaskets
  • Seals
  • Drill Bit and Fluid Separators

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