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Product Summary

8L90, Steel, Black powdercoated

  • It fits 8L90E transmissions in 1978-88 GM G-body Monte Carlo, Malibu, Cutlass, Grand Prix 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
  • Designed to accommodate your all of your transmission needs and provides clearance for large diameter aftermarket dual exhaust systems

Key Specs

MFG. Part #RCG-8L90
BrandG Force Crossmembers

Need To Know

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Details

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. On all 78-88 G body crossmembers, the passenger side hump is the taller of the two, and on some installations, it is necessary to remove the catalytic converter heat shield from the passenger side floor pan.

  • Fits 1978-1988 G-Body
  • Crossmember is installed so that the exhaust clearance humps are closed on the top and open on the bottom
  • 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.
  • The primary frame change on this generation of vehicles is beginning with 1984 models and the implementation of the 2004R transmission which required positioning the crossmember further to the rear of the vehicle. This is evidenced by 2 sets of frame holes for the crossmember on the driver side of the vehicle. G force has developed the frame extension (FE-100) to duplicate this longer frame on the early generation vehicles. The FE-100 needs to be purchased separately to install p/n RCG-4L80 into a 78-83 vehicle. Note: while this change was platform wide beginning in 1984, some 1983 Hurst Olds are known to have the 2004R transmission and thus the longer frame rail.

Application

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-6 Transmission Group:

  • Hydra-Matic 8L90 transmission (8L90E) - Slip Yoke

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Specifications

KEY SPECS
MFG. Part #RCG-8L90
BrandG Force Crossmembers
GENERAL
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.