Drivetrain Automatic Transmissions and Components

GForce

Transmission Crossmember for 8L90E/10L80E/10L90E Black

$495.00

SKU: RCG-8L90K

In Stock
In Stock
Ships by Sep 9
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The G Force RCG-8L90K is a transmission crossmember designed for 1978-1983 GM G-Body models. It is compatible with 8L90E Slip Yoke, 10L80E, and 10L90E transmissions.

This crossmember includes the GF-GMATM Transmission Mount and GF-8L90-A transmission mount adapter, as well as the FE-100 Frame Extension, to ensure proper fitment with the specified transmissions. It features a black powder-coated finish and comes with included mounting hardware.
Show original supplier description
The G Force RCG-8L90K transmission crossmember is specifically engineered for 1978-1983 GM G-Body vehicles, including models such as Malibu, Monte Carlo, El Camino, Cutlass, Grand Prix, Regal, Century, LeMans, and Caballero. It provides a direct fit for 8L90E Slip Yoke, 10L80E, and 10L90E transmissions, offering a robust solution for drivetrain support. This crossmember package includes essential components for a complete installation. The GF-GMATM Transmission Mount and the GF-8L90-A transmission mount adapter are provided to accommodate the tailshaft housings of the 8L90E and 10L90E transmissions. Additionally, the FE-100 Frame Extension is included to ensure proper integration with the vehicle's frame. Constructed for durability, the RCG-8L90K features a black powder-coated finish for corrosion resistance. Mounting hardware is included, simplifying the installation process. For optimal fitment, it is necessary to enlarge the holes in the vehicle's frame rails to 1/2″ to accommodate the provided 7/16″ hardware. Alternatively, if using stock 3/8″ hardware, using new Grade #8 fasteners is strongly recommended. G Force emphasizes ease of installation and performance engineering in their products. For those seeking a lighter-weight option, G Force also offers a next-generation crossmember, the RCG-400NG-BLK-8L90K.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandGForce
Part NumberRCG-8L90K
CategoryDrivetrain

We’re here — turning wrenches, just like you.

Call us, follow along, or come say hi.

Buy with Confidence

Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

View Full Return Policy

Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

View Full Shipping Policy