Product Summary

T56, 47.5" Centerline of Holes, Steel

  • It fits TREMEC T-56 transmissions in 1968-72 GM A body convertible
  • Specifically designed to fit the 1968-72 A-Body convertible or cars with boxed frames
  • It is finished in a black powder coating for added protection
  • Made from durable steel and measures a total of 47-1/2" in length
  • Designed to accommodate your all of your transmission needs and provides clearance for large diameter aftermarket dual exhaust systems

Key Specs

MFG. Part #RCAEC2-T56
BrandG Force Crossmembers

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G Force Performance is the premiere source for transmission crossmembers. Whether you're looking for an upgrade from stock components or parts crossmember to accommodate your all of your transmission needs and provides clearance for large diameter aftermarket dual exhaust systems. Finished in a black powder coat and includes new mounting hardware.

The supplied aluminum spacers are utilized to provide custom positioning of the transmission mount. They are to be positioned between the crossmember and the transmission mount. Select the desired amount of spacers and match a bolt of proper length to insure full engagement into the transmission mount. Some applications will not require any spacers. Some vehicles of this generation are equipped with a crossmember that bolts directly to the vehicles frame rail, while others are equipped with a crossmember that utilizes a tab that sets on the frame rail and is then clamped by a steel cap that is embedded with a rubber liner. The RCAE crossmember bolts directly to the frame rail and utilizes the factory frame holes. To utilize the provided 7/16 hardware it is necessary to enlarge the holes in the frame rails with a 1/2" drill. If the installer chooses to utilize the stock size 3/8 hardware, it is strongly recommended that the installer obtain Grade 8 fasteners and washers to compensate.

Note: The distance between crossmember frame holes is approximately 47-1/2". Measure your frame or crossmember to insure proper selection

  • Mounting hardware included
  • Crossmember center tube has a bracket welded to the back to accept the factory brake cable pulley
  • New fasteners are provided for the bottom-up bolts. The installer must reuse the long horizontal bolts


Since different transmissions can share the same overall lengths as well as other measurements, they can also share some transmission crossmembers. G-Force has grouped the transmissions together that can share the same crossmember.

This Crossmember fits the GM-5 Transmission Group:

  • Borg-Warner T-56 transmission
  • Tremec T-56 transmission
  • Tremec Magnum 11009 6-spd
  • Tremec Magnum 11010 6-spd
  • Tremec Magnum 11011 6-spd
  • Tremec Magnum 11012 6-spd
  • Tremec Magnum XL #12019 6-spd
  • Tremec Magnum XL #12021 6-spd



MFG. Part #RCAEC2-T56
BrandG Force Crossmembers
Transmission Mount IncludedNo
Centerline of Holes47.5"
Material TypeSteel
FinishBlack powdercoated
Sold in QuantityEach
NotesPlease note that G-Force crossmembers do not include the G-Force logo sticker as shown in the picture. This decal is shown for brand reference only.