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B&M Shift Improver Kit - Mopar A727/A904 Transmissions

1966-1970 Chrysler, Dodge and Plymouth A727 and 1966-1977 A904 Automatic Transmissions.

PART# 10226

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This B&M® Shift Improver™ kit fits all 1966-1970 Chrysler, Dodge and Plymouth TF727 transmissions with 6 cyl and V8 engines, along with 1966-1977 A-904 transmissions with 6 cyl engines and 1968-1970 A-904 transmissions with V8 engines. This kit recalibrates your automatic transmission for optimum performance, extended life by eliminating shift overlap and excess wear on clutches & bands due to slippage. You get two modes of performance to select from: Stage 1 Heavy Duty, or Stage 2 Street/Strip. Stage 1 gives firm positive shifts without loss of driver comfort for improved shifting performance in all street vehicles. Street/Strip is for high performance street use or for competitive events for the enthusiast who wants the hardest hitting, quickest possible shifts. All you need are basic tools, the included installation instructions and in the space of an afternoon you can turn your transmission into a B&M-tuned unit! Ask the thousands of satisfied customers that have installed one in their transmissions!


  • Two kits In One - Heavy Duty or Street/Strip
  • Over 65 Years of B&M Quality
  • Provides Firm Positive Shifts
  • Eliminates Shift Overlap
  • Easy to Install


Automotive Item GradeHigh Performance
Emission Code5
Gasket IncludedYes
Instructions IncludedYes
Product TypeAutomatic Transmission Valve Body Kit
California Proposition 65 Chemical NameCadmium and cadmium compounds
California Proposition 65 RequiredYes
Part Number10226



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.

In The Box

In The Box

  • Pan Gaskets
  • Separator Plate
  • Check Ball
  • Throttle Plug Blocker Rod
  • Adjustment Gauge

Tech Resources

Fits Chrysler, Dodge, Plymouth with Automatic Transmission, 1966-1970 with TF A-727 (All), 1966-1977 with TF A-904 (6 Cyl), 1968-1970 with TF A-904 (8 Cyl)


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