Chassis Components› Crossmembers

GForce

Crossmember

$395.00

SKU: RCB3-700

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 Crossmember RCB3-700 is a transmission crossmember designed for 1977-1990 GM B-Body models. It fits a range of transmissions including the 700R4, 4L60, pre-1996 4L60E, TKO-500, TKO-600, and TKX. This crossmember is also compatible with 1996 and later 4L60E and 4L65E transmissions, making it suitable for LS engine swaps.
Show original supplier description
The G-Force Crossmember RCB3-700 is a durable transmission support designed for 1977-1990 GM B-Body vehicles. It provides a direct bolt-in solution for fitting various transmissions, including the 700R4, 4L60, pre-1996 4L60E, TKO-500, TKO-600, and TKX. The crossmember is engineered to accommodate 1996 and later 4L60E and 4L65E transmissions, making it ideal for LS engine swap projects. This RCB3-700 model is specifically designed for 700R4/4L60E transmissions that utilize a case mount. For those with a tailshaft mount, the RCB3-400 crossmember is recommended instead. The design features two mounting slots to accept a standard height transmission mount, and it is finished in a black powder coat with included mounting hardware. A polyurethane transmission mount, such as the GMTM, is recommended and sold separately. The product information also lists several recommended Boss Hog Torque Converters for this application.

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 NumberRCB3-700
CategoryChassis Components

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

Call us, follow along, or come say hi.

(760) 282-4645 Instagram Google

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