Speed Gems

FE to 6R80/4R70W Transmission Adapter Kit

$1,350.00

SKU: FO203

In Stock
In Stock
Ships by Aug 31
Free Shipping over $200
$100 Minimum Order
30 Days Return

Description

The Speed Gems FO203 transmission adapter kit facilitates the integration of Ford FE series engines (352, 360, 390, 406, 427) with Ford Modular V8 automatic transmissions such as the 6R80 and 4R70W. This comprehensive kit includes essential components for a successful installation: an adapter plate, a crank adapter, a flexplate with a Ford 4x11.40” pattern, a high-torque mini-starter, an inspection cover, and all necessary mounting hardware including specialized bolts and dowel pins. It is important to note that if your torque converter has a smaller 4x10.5” pattern, you may need to contact Speed Gems for alternative flex plate options. Customers are responsible for ensuring proper throttle position signal provisions, and Speed Gems recommends checking US Shift's options for TPS Kits if needed. For transmissions requiring a shift computer, package deals are available with US Shift stand-alone controllers, including a recommended Quick 6 stand-alone for the 6R80, offering a cost savings on the adapter kit.

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

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Specifications

BrandSpeed Gems
Part NumberFO203
CategoryDrivetrain

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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.

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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.

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