Drivetrain› Automatic Transmissions and Components

Sun Coast Converters

Suncoast Converters 9 (245mm) High Performance Converter - Big Block COA-20425-1

$1,672.40

SKU: S02K COA-20425-1

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In Stock
Ships by Jun 11
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Non-Returnable Item
INSTALL DIFFICULTY
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Description

The Coan Racing COA-20425-1 9″ (245 mm) High Performance Converter (Big Block) is a purpose-built torque converter for TH350/TH400 transmissions powered by big block engines. With its compact 9″ size, it delivers high-performance stall characteristics tailored for aggressive launches and rapid fluid coupling, while fitting setups without modification. Ideal for racing, the COA-20425-1 maintains hydraulic stability through extended use, providing dependable launches and torque handling exactly when and where it’s needed. Built to Coan’s high performance standards, this converter brings a compact package loaded with thermal resilience, structural rigidity, and race-level hydraulics, making it a top-tier choice for high-output big block TH-series builds.

Fitment

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

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Specifications

BrandSun Coast Converters
Part NumberS02K COA-20425-1

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.

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