Product Summary

8L90, 43.25" Centerline of Holes, Steel

  • It fits 8L90E transmissions in 1964-67 GM A body convertible
  • Specifically designed to fit the 1964-67 A-Body convertible
  • It is finished in a black powder coating for added protection
  • Made from durable steel and measures a total of 53-5/8" 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 #RCAEC1-8L90
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.

Note: 1964-1967 Convertible or boxed frame- the distance between crossmember frame holes is approximately 43-1/4". Measure your frame or crossmember to insure proper selection

  • Does not fit coupe, sedan, 4 door. 1964-67 Convertible frame only.
  • Mounting hardware included
  • 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.


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



MFG. Part #RCAEC1-8L90
BrandG Force Crossmembers
Transmission Mount IncludedNo
Centerline of Holes43.25"
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.