Product Summary

4L60E, 4L65E, 4L70E, 700R4, T5, TKO, Steel

  • It fits 700R4, 4L60E, and T-5 transmissions in 1978-88 G-body
  • Specifically re-designed to be lighter for performance
  • It is finished in a black powder coating for added protection
  • Made from durable steel
  • Designed to accommodate your all of your transmission needs and provides clearance for large diameter aftermarket dual exhaust systems

Key Specs

MFG. Part #RCG-700NG-BLK
BrandG Force Crossmembers

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Lighter Weight with Same Strength, Durability, and Reliability

At G Force, refining our products does not stop at fitment. We set high standards to ensure that the Crossmembers Next Gen will withstand the demanding service you experience on the road or racecourse.

Proven Strength

Tested under the harshest conditions by experienced racers, our legacy Crossmembers have stood the test of time. Even though we re-engineered our most popular Crossmembers to weigh up to 50% less, they meet the same stringent standards. Additionally, the lighter weight makes our newest Crossmembers a practical choice for a broader range of projects.

Crossmembers Next Gen Independently Tested

The next generation of Crossmembers underwent the same testing as our legacy products. The results of the Load vs. Deflection test performed by an independent consulting firm, show a negligible difference in the strength of the newest Crossmembers compared to the legacy product.

Crossmember is Black-Satin Powdercoated for a durable finish, and includes new Grade#8 mounting hardware. Transmission Mount is purchased separately, and we recommend a Polyurethane Transmission Mount, such as GForce part # GMTM.

Installation notes:

  • On all 78-88 G body crossmembers, the passenger side hump is the taller of the two.
  • On some installations, it is necessary to remove the catalytic converter heat shield from the passenger side floor pan.
  • This generation of vehicle is prone to body bushing compression, even with some southern vehicles. If the floor pan is too close to allow installation, it may be necessary to replace the body bushings. Some customers have reported that with slight interference instances, they have been able to gently lift the floor pan with the assist of a floor jack and a wood cushion, thus providing the required clearance for installation.
  • The crossmember is installed so that the exhaust clearance humps are closed on the top and open on the bottom.


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-2 Transmission Group:

  • Turbo Hydra-Matic 700R4 (TH700R4)
  • Hydra-Matic 4L60 transmission
  • Hydra-Matic 4L60-E transmission
  • Tremec TKO-500
  • Tremec TKO-600
  • Tremec TKO-4615
  • Tremec TKO-4616
  • Tremec TKO-4617
  • Tremec TKO-4618
  • Tremec TKO-5008
  • Tremec TKO-5009
  • Tremec TKO-5201
  • Borg-Warner T-5
  • Tremec T-5 #1352-000-251



MFG. Part #RCG-700NG-BLK
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.