Product Summary

T56, Steel, Black powdercoated

  • It fits TREMEC T-56 transmissions in 1977-90 GM B-body Impala, Bonneville, and more
  • Specifically designed to fit 1977-90 GM B-body
  • It is finished in a black powder coating for added protection
  • Made from durable steel and measures a total of 31-3/4" 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 #RCB3-T56
BrandG Force Crossmembers

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For all you Classic B-Body Builders, we've designed a direct bolt-in transmission crossmember to accommodate your swapped transmission while still using the factory crossmember mounting locations. No drilling, cutting, grinding, or welding! Simple and complete instructions are included, along with new mounting hardware.

NOTE: Many G Force Crossmembers utilize the early GM double stud transmission mount configuration, for the increased strength aspects. Should your vehicle originally be equipped with a single centered stud transmission mount, simply replace your transmission mount with the early style.

  • Fits 1977-1990 B-Body
  • Large exhaust clearance humps for large diameter exhaust systems


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 #RCB3-T56
BrandG Force Crossmembers
Transmission Mount IncludedNo
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.