Suncoast CAT1 500 HP CUSTOM ALLISON TRANSMISSION WITH CONVERTER 2WD (GMAX-CAT1-LB7-0103-2WD) for 2001-2004 Duramax LB7

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The Suncoast Category 1 Suncoast 500 HP Custom Allison Transmission with Converter (GMAX-CAT1-LB7-0103-2WD) is a high-performance transmission designed for 2001–2004 GM Duramax LB7 2WD trucks. Built to handle up to 500 horsepower, it features upgraded internals and tuning for better shift quality, torque capacity, and reliability. Paired with a matched high-performance torque converter, it offers enhanced drivability and is ideal for towing, daily driving, and mild performance upgrades.

Core Charge*

Cores must be shipped within 30 days.

Total: $8,100.00
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SKU: GMAX-CAT1-LB7-0103-2WD Categories: , , ,
Description

The Suncoast Category 1 Suncoast 500 HP Custom Allison Transmission with Converter for 2WD (GMAX-CAT1-LB7-0103-2WD) is engineered specifically for 2001–2004 GM Duramax LB7 diesel trucks. Designed to handle up to 500 horsepower, this custom-built transmission package delivers exceptional durability and performance for street-driven and lightly modified trucks. Suncoast incorporates upgraded internal components and precision tuning to provide improved shift quality, increased torque capacity, and enhanced reliability over the factory Allison transmission. The included high-performance torque converter is matched to the transmission to ensure optimal power transfer and drivability. Ideal for towing, daily driving, or mild performance upgrades, this transmission solution is a proven choice for LB7 owners seeking both strength and dependability.

Additional information
Weight 48 lbs
Dimensions 19 × 16 × 13 in
Fitment

Fitment

2001-2004 Duramax LB7

Features

Features

  • For 2WD Applications
  • SunCoast custom clutch packs
  • SunCoast custom Steels
  • SunCoast custom billet plates
  • SunCoast custom overhaul kit
  • Valve body calibration kit
  • SunCoast gasket kit
  • Pan Filter
  • Spin on filter
  • Pan gasket
  • SunCoast Filter Loc
  • New internal wiring harness
  • SunCoast Triple Disc Billet Category 1 Converter
The Torque Converter
 
SunCoast Allison 1000 torque converters come in many varieties, from heavy hauling, sled pulling, drag racing, to daily driving. Here at SunCoast we design and manufacture all of our torque converters in house. Because of this unique advantage SunCoast can supply almost any request in regards to stall speed or torque multiplication. All of our SunCoast Allison triple disc converters are outfitted with a heavy duty forged billet steel cover and give unbeatable lock up performance. 
 
All of the SunCoast Allison 1000 torque converters come standard with custom pump and turbine modifications (in house). SunCoast also Tig Welds each individual furnace brazed fin for improved reinforcement. The SunCoast Allison billet triple disc converter also comes standard with our proprietary trapezoidal clutch teeth.
 
New internal wiring harness
 
Every build here at SunCoast reliability is our number one priority. Each one of our (Category) Allison Transmissions comes with a new internal wiring harness. As the transmission continues to age, the plastic connectors become brittle and will break during disassembly. This will eventually lead to premature failure. 
 
Some other transmissions exclusives include SunCoast proprietary C1, C2, C3, and C4 Alto carbonite frictions/Rabestos SCZ frictions that contain no center slots. These frictions utilize a waffle pattern in the material to help retain oil helping the clutch cool when not applied. Redesigned apply pistons with improved rubber compounds proven to hold higher heat. This custom piston allows us to use a thicker spring apply plate which replaces the thin OEM one that will cone and cause uneven apply surface resulting in premature clutch failure. Custom SunCoast apply plate that redirects fluid to better lubricate frictions from the inside out which lubes the entire friction rather than OEM style that lubricates from the center out leaving the inner half of the clutch burnt. Includes exclusive smart trim / clutch control valve. Includes all items needed to modify the C2 clutch piston for increased clutch durability.

Note: A $500 shipping surcharge will be added.

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About brand
SunCoast Diesel Performance builds transmission and drivetrain upgrades for diesel trucks. The company focuses on strength, durability, and torque handling. SunCoast diesel transmissions support towing, daily driving, and performance use. SunCoast designs torque converters, valve bodies, and transmission components. These parts help handle increased power and heavy loads. Stronger driveline parts improve reliability under stress. Diesel owners trust the brand for proven transmission solutions. These upgrades perform well in real-world driving conditions.
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