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White Box Transmission Crossmember

Gen III Hemi Swap Transmission Crossmember for 1966-70 Mopar B-Body

PART# WB130021

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$129.95   Holleydays Price
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White Box transmission crossmember is one part of the most comprehensive line of GEN-3 Hemi Swap components available for the Mopar B-Body. This Crossmember allows the installation of the popular A727 3-speed, NAG1 5-Speed and 8HP70 8-speed automatic transmissions when used with the corresponding adapter plate (sold separately). No cutting or drilling is necessary, Just bolt it in the OEM location using the supplied hardware. The modular design allows the use of several different transmission options without the need to buy or fabricate a different Crossmember - simply change to a different adapter plate and the drive line and u-joint alignment have been preset to the corresponding transmission. This Crossmember uses a GM style transmission mount for its compact design that allows for better ground clearance than the OEM crossmember (Hooker part number 71223029HKR or 71223030HKR - sold separately). Solid 3/16" Steel construction w/ raw steel unpainted finish.


  • Engineered Transmission Mount System Works Together with Engine Mounting Brackets & Hooker Blackhear Long Tube Headers and Exhaust Systems for an Easy Trouble Free Gen III Hemi Engine Swap in the 66-70 B-Body Mopar Platform
  • Accommodates Popular A727, NAG1 , or 8HP70 Transmissions (Requires Transmission Specific Adapter Plate)
  • Uses the OEM Mounting Holes - for Easy Installation
  • High Tuck Design to Maximize Ground Clearance
  • Accommodates Up to 3” Exhaust
  • Uses GM Style Transmission Mount - Hooker Part# 71223029HKR or 71223030HKR (Sold Separately)
  • Raw Unpainted Finish allows Easy Modifications & Great Value
  • Heavy Duty 3/16” Steel Construction - for Strength & Durability
  • Includes Hardware & Instructions


Application1966-1970 Mopar B-Body
BrandWhite Box
Emission Code6
Motor TypeChrysler Gen III Hemi
Product TypeTransmission Crossmember
Type of ComponentTransmission Crossmember
Part NumberWB130021



Vehicle emissions regulations are not applicable to this item.

Tech Resources

This Crossmember Requires Transmission Specific Adapter Plate (sold Separately) WB130022 A727 Transmission Adapter WB130023 NAG1 Transmission Adapter WB130024 8HP70 Transmission Adapter Requires 2-bolt GM style transmission mount (Hooker p/n: 71223029HKR or 71223030HKR - sold separately).


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