Collection: SunCoast Transmission
SunCoast Diesel – High-Performance Transmissions & Drivetrain Solutions
SunCoast Diesel is a leader in high-performance transmission systems, torque converters, and drivetrain components for Cummins, Duramax, and Power Stroke diesel trucks. Engineered for superior durability and power handling, our products ensure maximum performance for towing, daily driving, and competitive racing applications.
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Suncoast TH400 Deluxe Racing Master Overhaul Rebuild Kit
Regular price $695.00 USDSale price $695.00 USD Regular priceUnit price / per -
Suncoast TH400 Direct Clutch Pack - 5 Frictions (.082" - OEM QTY) & 5 Steels (.078")
Regular price $99.88 USDSale price $99.88 USD Regular priceUnit price / per -
Suncoast TH400 Direct Clutch Pack - 6 Frictions (.082") & 2 (.078") / 4 (.090") Steels
Regular price $112.95 USDSale price $112.95 USD Regular priceUnit price / per -
Suncoast TH400 Direct Clutch Pack - 7 Frictions & 1 (.090") / 6 (.062") Steels - Requires ATI 405370L
Regular price $239.85 USDSale price $239.85 USD Regular priceUnit price / per -
Suncoast TH400 Direct Clutch Pack - 8 Frictions & 8 Steels - Requires ATI 405370L
Regular price $297.82 USDSale price $297.82 USD Regular priceUnit price / per -
Suncoast TH400 Direct Friction Plate, Smooth, Green - .062" Thickness
Regular price $22.38 USDSale price $22.38 USD Regular priceUnit price / per -
Suncoast TH400 Direct Friction Plate, Waffle, Green - .082" Thickness
Regular price $11.23 USDSale price $11.23 USD Regular priceUnit price / per -
Suncoast TH400 External Case Cooling Hardware Kit
Regular price $309.62 USDSale price $309.62 USD Regular priceUnit price / per -
Suncoast TH400 External High Flow Cooler Pressure Dump Kit
Regular price $847.50 USDSale price $847.50 USD Regular priceUnit price / per -
Suncoast TH400 Filter Relocation Kit
Regular price $437.25 USDSale price $437.25 USD Regular priceUnit price / per -
Suncoast TH400 Fluid Overflow Tank
Regular price $337.50 USDSale price $337.50 USD Regular priceUnit price / per -
Suncoast TH400 Forward & Direct Clutch Piston w/Checkball
Regular price $240.00 USDSale price $240.00 USD Regular priceUnit price / per -
Suncoast TH400 Forward & Direct Steel, 12 Tab - .090" Thickness
Regular price $11.47 USDSale price $11.47 USD Regular priceUnit price / per -
Suncoast TH400 Forward & Direct Steel, 12 Tab, OEM Size - .078" Thickness
Regular price $11.47 USDSale price $11.47 USD Regular priceUnit price / per -
Suncoast TH400 Forward & Direct Steel, 14 Tab - .062" Thickness
Regular price $21.23 USDSale price $21.23 USD Regular priceUnit price / per -
Suncoast TH400 Forward Clutch Pack, Smooth, Tan - 5 Frictions (.081") & 5 Steels (.075")
Regular price $94.92 USDSale price $94.92 USD Regular priceUnit price / per -
Suncoast TH400 Forward Drum w/ 300 Maraging Steel Input Shaft
Regular price $595.00 USDSale price $595.00 USD Regular priceUnit price / per -
Suncoast TH400 Forward Friction Plate, Smooth, Tan - .062" Thickness
Regular price $14.05 USDSale price $14.05 USD Regular priceUnit price / per -
Suncoast TH400 Forward Friction Plate, Smooth, Tan - .081" Thickness
Regular price $11.23 USDSale price $11.23 USD Regular priceUnit price / per -
Suncoast TH400 Front Pump Seal For Super Pump w/ Big Shaft (Rubber Clad)
Regular price $51.62 USDSale price $51.62 USD Regular priceUnit price / per -
Suncoast TH400 Heavy Duty 300M Steel Intermediate Shaft
Regular price $395.00 USDSale price $395.00 USD Regular priceUnit price / per -
Suncoast TH400 Heavy Duty Direct Clutch Drum
Regular price $295.00 USDSale price $295.00 USD Regular priceUnit price / per -
Suncoast TH400 Heavy Duty Direct Clutch Drum w/ 34 Element Sprag
Regular price $595.00 USDSale price $595.00 USD Regular priceUnit price / per -
Suncoast TH400 High Flow OEM Style Boost Valve Kit
Regular price $89.88 USDSale price $89.88 USD Regular priceUnit price / per -
Suncoast TH400 Intermediate Clutch Pack - 4 Frictions (.070") & 4 Steels (.070")
Regular price $103.75 USDSale price $103.75 USD Regular priceUnit price / per -
Suncoast TH400 Intermediate Clutch Pack, Red - 5 Frictions (.060") & 5 Steels (.062")
Regular price $197.38 USDSale price $197.38 USD Regular priceUnit price / per -
Suncoast TH400 Intermediate Friction Plate, Grooved, Blue - .080" Thickness
Regular price $60.45 USDSale price $60.45 USD Regular priceUnit price / per -
Suncoast TH400 Intermediate Friction Plate, Smooth, Green - .070" Thickness
Regular price $12.48 USDSale price $12.48 USD Regular priceUnit price / per
SunCoast Diesel – High-Performance Transmissions & Drivetrain Solutions
SunCoast Diesel is a leader in high-performance transmission systems, torque converters, and drivetrain components for Cummins, Duramax, and Power Stroke diesel trucks. Engineered for superior durability and power handling, our products ensure maximum performance for towing, daily driving, and competitive racing applications.
Our extensive product lineup includes billet torque converters, transmission rebuild kits, valve bodies, clutch packs, and custom-built performance transmissions—each designed to handle extreme torque and horsepower. Whether you're looking to upgrade for better towing capacity, smoother shifting, or all-out race performance, SunCoast Diesel has the solution.
Built with precision and tested under the toughest conditions, SunCoast Diesel transmissions and components deliver unmatched strength and reliability. Our innovative designs reduce transmission slippage, enhance shift response, and improve overall drivetrain efficiency, making them the preferred choice for diesel enthusiasts and professional builders.
Upgrade your diesel truck’s transmission with SunCoast Diesel’s premium performance parts. Shop now and experience industry-leading durability, efficiency, and power transfer!









