Drivetrain› Automatic Transmissions and Components

Sun Coast Converters

Suncoast TH400/4L80E Aluminum Direct Drum Extra Large Sprag SUNSC-223900B

$1,733.33

SKU: S02K SC-223900B

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping over $100
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Description

Suncoast TH400/4L80E Aluminum Direct Drum Extra Large Sprag SUNSC-223900B

MIA's Description

High-performance aluminum direct drum for TH400/4L80E transmissions, designed for Pro-Street, Pro-Mods, and Top Sportsman applications. Constructed from 7075 T6 billet aluminum with a billet aluminum piston. Accommodates up to 6 frictions and features 1/4-inch locking dowels to prevent inner race movement. 45% lighter than OEM assembly.

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 SC-223900B

Videos

B&M Vacuum Modulator for GM TH350 & TH400 Automatic Transmissions 20234

B&M Vacuum Modulator for GM TH350 & TH400 Automatic Transmissions 20234
4L80E Vs TH400: Which One Do you Choose?

4L80E Vs TH400: Which One Do you Choose?
Rebuilding the GM Turbo 400 TH400

Rebuilding the GM Turbo 400 TH400
TH400 Torque Converter Install (Made EASY)

TH400 Torque Converter Install (Made EASY)
GM TH400 Automatic Transmission Rebuild For Dummies

GM TH400 Automatic Transmission Rebuild For Dummies
The SECRET GM Transmission Part You NEVER KNEW Existed Revealed!

The SECRET GM Transmission Part You NEVER KNEW Existed Revealed!
Here Is Why People Blow Up Their TH400 Transmission - Follow These Few Tips To Help Avoid That

Here Is Why People Blow Up Their TH400 Transmission - Follow These Few Tips To Help Avoid That
How to Install your Converter the Right Way!

How to Install your Converter the Right Way!
Lokar Anchor-Tight Locking Flexible Trans Dipstick Install TH400

Lokar Anchor-Tight Locking Flexible Trans Dipstick Install TH400
Shifting issues on a TH400 Transmission

Shifting issues on a TH400 Transmission
HOW TO INSTALL GM TORQUE CONVERTERS!!

HOW TO INSTALL GM TORQUE CONVERTERS!!
See What's Inside the New Sonnax 4L80-E Performance Pack

See What's Inside the New Sonnax 4L80-E Performance Pack
Aftermarket shifter 4 the 4l80E

Aftermarket shifter 4 the 4l80E
TCI Overdrive 4L80E Transmission & Converter Install In Off-Road Chevrolet Truck

TCI Overdrive 4L80E Transmission & Converter Install In Off-Road Chevrolet Truck
1991 - 2009 GM Truck Van 4L80E Transmission In Vehicle Partial Rebuild P1870 P730 P756 (Chevy & GMC)

1991 - 2009 GM Truck Van 4L80E Transmission In Vehicle Partial Rebuild P1870 P730 P756 (Chevy & GMC)
4L80 TRANSMISSION INSTALL || EASY

4L80 TRANSMISSION INSTALL || EASY
4l80e Swap in 99-07 GM Truck Part 3: wiring, tuning, plus a test drive

4l80e Swap in 99-07 GM Truck Part 3: wiring, tuning, plus a test drive
4L80E Differences between Early and Late models

4L80E Differences between Early and Late models
HOW TO: Install/Replace 4L80E transmission harness

HOW TO: Install/Replace 4L80E transmission harness
4L60e to 4L80e Transmission Swap - What to buy

4L60e to 4L80e Transmission Swap - What to buy

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