SKU: ATS309-833-4272

Stage 3 Allison LCT1000 Crate Transmission

Ships From Manufacturer in 15-20 Days
Confirmed fitment below
YEARS
2003-2004
MAKE / MODEL
GM/Chevrolet/GMC / Silverado/Sierra
SERIES
2500HD/3500HD
ENGINE
6.6L Duramax LB7/6.6L Duramax LLY
Price
$7,809.99
or
American Express
Apple Pay
Diners Club
Discover
Google Pay
Mastercard
PayPal
Shop Pay
Visa
Free Shipping
ORDERS $70+
Easy Returns
HASSLE-FREE
Earn Rewards
ALLIGATOR POINTS
Not sure this fits your build?
Our diesel experts know these trucks. Call or chat before you buy.
1-208-719-7400

PRODUCT DETAIL

Key Features & Description

Features:

  • Fits 2003-2004 Duramax LB7 2WD trucks
  • Stage 3 complete transmission package
  • Includes ATS Five Star torque converter
  • Deep pan improves cooling and fluid capacity
  • ATS Co-Pilot for enhanced shift control
  • Billet input shaft for added strength
  • Designed for PTO-equipped 2WD applications
  • Ideal for towing or performance upgrades
  • Engineered for long-term durability
  • $500 shipping surcharge applies at checkout

Serious Transmission Upgrade for Hard-Working LB7 Trucks

If you count on your 2003-2004 LB7 Duramax-powered Silverado or Sierra to handle daily work or weekend projects, the ATS 309-833-4272 Stage 3 Allison LCT1000 Crate Transmission is a smart way to upgrade performance and long-term reliability. Specifically built for 2WD trucks with PTO capability, this complete transmission package gives you the extra strength and smoother operation needed to tackle towing, hauling, or high-performance upgrades with confidence. With ATS’s Five Star Torque Converter included, you’ll enjoy better torque delivery and improved drivability whether you’re pulling heavy loads or simply looking to restore smooth, responsive shifting.

Built for Heavy Loads and Long-Term Durability

To help your transmission handle the heat, ATS includes a deep transmission pan that increases fluid capacity and improves cooling, keeping your transmission protected when the work gets tough. Their Co-Pilot Transmission Controller takes shift management to the next level by optimizing shift timing and pressure for smoother, more reliable gear changes under load. The package is rounded out with a billet input shaft designed to handle added torque without the common failures of stock parts. Whether you’re upgrading for work, play, or both, this transmission package is ready to help you get the job done right. Don’t forget, a $500 shipping surcharge will be added at checkout.

Fits: 2003, 2004 GM Silverado/Sierra 2500HD/3500HD 6.6L Duramax LB7 PTO 2WD

FITMENT GUIDE

Exact Fitment — Verify Your Year

Year RangesYears
Make
Model
Series
Engine
2003-2004
GM/Chevrolet/GMC
Silverado/Sierra
2500HD/3500HD
6.6L Duramax LB7/6.6L Duramax LLY

Document Downloads

Forms & Guides

CUSTOMER REVIEWS

What Buyers Say

Call a Diesel Expert, we'll find the right fit for your build

Not sure this part is right for your truck? Our team knows these platforms inside out. No hold music, no scripts.

Chat with Us