4L80E Transmission Crossmember | 1977–1990 GM B-Body — G Force Performance Products
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Product Information

Description

B-Body 4L80E crossmember fitment (1977–1990)

  • GM B-Body platforms including Caprice, Impala, LeSabre, Oldsmobile 88, Bonneville, Parisienne, and Catalina.
  • Fits GM B-Body Models: Caprice, Impala, LeSabre, Oldsmobile 88, Bonneville, Parisienne, Catalina. Fits Years: 77-90 (including 1990 B-Body applications)

Transmission compatibility: 4L80E / 4L85E 

  • Fits Transmissions: 4L80E, 4L85E — for B-Body 4L80E crossmember applications.

G Force crossmember B-Body install note

  • A new transmission mount is recommended. P/N: GMTM.

B-Body 4L80E crossmember fitment (1977–1990)

  • GM B-Body platforms including Caprice, Impala, LeSabre, Oldsmobile 88, Bonneville, Parisienne, and Catalina.
  • Fits GM B-Body Models: Caprice, Impala, LeSabre, Oldsmobile 88, Bonneville, Parisienne, Catalina. Fits Years: 77-90 (including 1990 B-Body applications)

Transmission compatibility: 4L80E / 4L85E 

  • Fits Transmissions: 4L80E, 4L85E — for B-Body 4L80E crossmember applications.

G Force crossmember B-Body install note

  • A new transmission mount is recommended. P/N: GMTM.

G Force and our Partner Brands engineer bold solutions that make installation easier without sacrificing quality. Get more support from G Force.

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Our engineers are also car enthusiasts—which makes designing automotive parts second nature. Because we use our products, we know the importance of crafting them with strength and durability. Get more performance from G Force.

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Specifications

Weight: 37 lbs

Shipping Dimensions: 51 × 19 × 6 In

Finish: Black Powder Coated

Mounting Hardware: Included

See the G Force Crossmember Overview for more info.

For vehicles originally equipped with 3/8″ crossmember bolts, open existing holes on the frame to 1/2″. If you prefer to retain 3/8″fasteners, upgrade the installatin hardware to Grade 8 bolts and hardened flat washers.

Some minor contact between the floorplan and the crossmember may occur due to body bushing settling and deterioration, or a bowed floor pan. Usually, this is not a problem. A hydraulic floor jack with a wood cushion will correct a bowed floor.

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