Drivetrain Automatic Transmissions and Components

Sun Coast Converters

Suncoast Converters 9 (245mm) High Performance Converter - Small Block COA-10428-1

$1,672.40

SKU: S02K COA-10428-1

In Stock
In Stock
Ships by Jun 11
Free Shipping
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Advanced — 4+ hours

Description

The Coan Racing COA-10428-1 9″ (245 mm) High Performance Converter (Small Block) is a high-performance torque converter tailored for GM Powerglide applications and Small-Block engines. Constructed with a durable internal assembly designed for racing, it delivers enhanced torque multiplication and efficient fluid coupling needed to handle increased power and heat. Retaining the standard 245 mm size for drop-in compatibility, this converter replaces factory units while offering elevated stall characteristics and improved drain-back, key traits for aggressive launches and repeated launch cycles. The COA-10428-1 ensures stable performance under continuous high-load conditions, making it ideal for circle-track, drag, or bracket racing builds. Whether you're building a Small-Block Powerglide from the ground up or upgrading your existing setup, this converter provides a reliable, installation-ready solution for enhanced throttle response and consistent power delivery on track.

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

BrandSun Coast Converters
Part NumberS02K COA-10428-1

Buy with Confidence

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