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White Box NAG1 Transmission Adapter Plate

Gen III Hemi Swap NAG1 Transmission Adapter Plate for 1966-70 Mopar B-Body

PART# WB130023

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White Box transmission adapter is part of the most comprehensive line of GEN-3 Hemi swap components available for the Mopar B-Body. The WB130023 crossmember adapter plate allows the installation of the popular NAG1 6-speed automatic transmissions when used with the WB130021 Transmission Crossmember. The WB130023 Adapter Plate bolts directly to the OEM transmission mount location with the supplied hardware and eliminates the daunting task of figuring out correct drive line inclination and U-Joint operation angles. WB130023 transmission adapter plate is designed for use with GM style transmission mount for its compact design that allows for better ground clearance than the OEM crossmember (use w/ Hooker part # 71223029HKR or 71223030HKR - sold separately). Solid 3/16" Steel construction with unpainted raw finish.


  • Engineered Transmission Adapter Plates Works Together w/ White Box Transmission Crossmember & Engine Mounting Brackets, and Hooker Blackheart Long Tube headers & Exhaust Systems for an Easy Trouble Free Gen III Hemi Engine Swap in the 66-70 B-Body Mopar P
  • Accommodates Popular NAG1 Transmission (Requires WB130021 Crossmember)
  • Sets Driveline Inclination Angle to Approximately 2.0 - 2.5 Degrees with Proper U-Joint Operation Angle When Used with BHS531 Engine Mounting Brackets and V8 K-member
  • Uses Hooker Transmission Mount - Hooker Part # 71223029HKR or 71223030HKR (sold separately)
  • Accommodates up to 3” Exhaust
  • Raw Unpainted Finish allows Easy Modifications & Great Value
  • Heavy Duty 3/16” Steel Construction
  • Includes Mounting Bolts to Attach to Transmission & Transmission Mount


Application1966-1970 Mopar B-Body
BrandWhite Box
Emission Code6
Motor TypeChrysler Gen III Hemi
Product TypeTransmission Mount
Type of ComponentAdapter
Part NumberWB130023



Vehicle emissions regulations are not applicable to this item.

Tech Resources

Use with WB130021 Transmission Crossmember (sold separately) Requires 2-bolt GM style transmission mount (Hooker p/n: 71223029HKR or 71223030HKR sold separately). May require 1" shift linkage extension (shift linkage rod length varies) Some transmission tunnel massaging will be required (around shift linkage). Minor trimming of unused- nonstructural casting flash and tabs will be required to the transmission case. Shifter cable bracket may need to be fabricated. Output flange adapters (tone ring) and custom drive shaft are required.


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         X  Holleydays 2020 20% off and DD
         X  Holleydays 2020 20% off and DD