SKU: ATS309-983-4308

Lct1000 6 Speed Stage 1 Transmission Package

Ships From Manufacturer in 15-20 Days
Confirmed fitment below
YEARS
2006-2007
MAKE / MODEL
GM /
SERIES
2500HD/3500HD
ENGINE
8.1L Vortec V8
Price
$5,279.99
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PRODUCT DETAIL

Key Features & Description

Features:

  • Stage 1 performance upgrade package for LCT1000 6-speed transmission

  • Designed for 2006–2007 GM 8.1L V8 2WD trucks

  • Includes upgraded clutch packs and valve body modifications

  • Enhances transmission durability and shift quality

  • Supports mild performance upgrades and heavy towing

  • Direct-fit components for simplified installation

Product Overview
The ATS 309-983-4308 LCT1000 Stage 1 Package is a performance-focused solution for improving the reliability and shift responsiveness of your GM 8.1L-powered 2WD truck. Designed to handle increased towing demands and mild horsepower upgrades, this kit includes key internal enhancements that strengthen the transmission and improve overall drivability. Perfect for daily use, towing, and work applications, it helps extend transmission life while enhancing performance.

Fitment:
2006, 2007 Chevrolet Silverado/GMC Sierra 2500HD/3500HD 8.1L Vortec V8 (2WD with LCT1000 6-Speed Transmission)

Warranty
Backed by ATS Diesel Performance’s limited manufacturer warranty. Refer to ATS for complete warranty terms.

Fitment Notes:

  • For use with LCT1000 6-speed transmissions in 2WD GM trucks

  • Compatible with stock and lightly modified engines

  • Professional installation recommended for best results

FITMENT GUIDE

Exact Fitment — Verify Your Year

Year RangesYears
Make
Model
Series
Engine
2006-2007
GM
2500HD/3500HD
8.1L Vortec V8

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