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Transmissions

Assembled here in the USA with proven parts and techniques. Tow. Street. Race. GET MORE!

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Converters

Prideful in the quality of work that goes into our products. The strongest, fastest torque converters.

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Chevy / GMC

Rebuild Kits

SunCoast transmission rebuild kits set the bar. The BEST of the BEST.

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SunCoast Specials

2.84 Gear Ratio Planet

4l80E Billet Overdrive Planet

6L80E Rear Planetary Assembly with 4140 HTSR Billet Steel Drive Plate

Smart-Tech Input Housing Kit

SunCoast 8HP90 Snake Charmer

TH400/4L80E Aluminum Direct Drum & Extra Large Sprag

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10L90 XPL PRO-LOC BILLET TORQUE CONVERTER This new 10-Speed Bolt-Together Torque Converter is manufactured from a solid piece of 7075 T6 billet aluminum plate versus round bar like so many other manufacturers. We take this extra step in manufacturing from solid billet plates due to the superior heat-treating characteristics. When using round bar, we see the tempering is not as solid in the center as with the solid plate. Using this type of material increases manufacturing cost initially, as well as machine operation time, however is a necessary step when considering the high inertia and its effects on ballooning the converter. Learn More

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Suncoast Performance Do What You Cant... A look into the lifestyle

These knuckleheads think diesels are stupid. What do y'all think?

6L80E BILLET SHAFT AND HUB

An essential upgrade for any hard-working GM 6L80 transmission, this Sonnax heavy duty 4-5-6 clutch hub and intermediate shaft guarantees maximum protection against shaft breakage and clutch failure in any vehicle pushing stock components to the limit.

The one-piece design is custom forged from ultra high-strength 300M billet steel, then heat treated and shot peened for added durability. This combination of features guards against broken 4-5-6 hubs and the risk of rear splines shearing off — chronic failures in performance cars and trucks as well as heavy commercial vehicles.

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SunCoast carries quality-designed and manufactured transmission parts & some badass apparel to rep that SunCoast Life. Whether sled pulling, drag racing or hauling heavy loads, SunCoast has you covered.

Heavy Duty Input Shaft

Heavy Duty Output Shaft 4WD/AWD

Pinless Accumulator Piston Kit

Dealer Benefits

Leading the diesel transmission industry in innovation. SunCoast takes great pride in providing their authorized dealers with the best products and most accurate tech support possible. This translates to a seamless experience for the customer from the manufacturer to the dealer.

Complete Access to the SunCoast Product Line
Co-op Advertising Campaigns
Access to SunCoast Marketing Materials
Access to Unlimited Technical Data & Resources
Incentive Volume-based Pricing
Unparalleled Customer Service