🧩 Product Description
🔧 Product Overview

This adapter flywheel flexplate kit is engineered to connect GM Gen III LS engines with popular automatic transmissions, providing a reliable solution for LS swap applications. Designed for correct crankshaft alignment and torque converter engagement, it ensures smooth power transfer and stable drivetrain operation.

🚗 Compatible Engines & Transmissions

Compatible Engines (6-Bolt Crank Only):

Fits GM Gen III LS engines including:

LS1 (1997–2007)

LS6 (1997–2007)

LS2 (2005–2009)

4.8L / 5.3L / 6.0L truck engines: L33, L59, LM4, LM7, LQ4, LQ9, LR4

Compatible Transmissions:

TH350

Powerglide

200-4R

700R4

4L60

⚠ Not Compatible With:

Gen IV LS engines with 8-bolt crankshaft

4L80E transmissions

Some early 1999–2000 LQ4 engines (please verify bolt pattern before ordering)

🔁 Replacement Part Numbers

Replacement for: 91604000, 57534610, 244-2901, 575-18346, 230-7303, LSOT00142, LSRB200748

💪 High-Strength Construction

Manufactured from premium-grade steel, this flexplate and adapter kit is built to withstand high torque and RPM conditions. The rigid structure resists flexing, cracking, and fatigue, ensuring long-term durability in performance, street, and swap applications.

⚙️ Functional Advantages

Corrects crankshaft-to-transmission compatibility for Gen III LS swaps

Ensures proper torque converter spacing and engagement

Maintains smooth starter engagement and stable rotation

Helps reduce vibration caused by mismatched drivetrain components

🧰 Package Includes

(1) Transmission Adapter Flexplate

(6) Gen III LS Flexplate Bolts

(1) LS Crank Sleeve Adapter

(1) Torque Converter Bolt Kit

🛠 Installation Notes

Designed for direct-fit installation on compatible Gen III LS engines

Please confirm crankshaft bolt count, torque converter bolt pattern, and starter ring gear compatibility before installation

Professional installation is recommended for best results

📦 Application Scenarios

Ideal for LS engine swaps into classic cars, muscle cars, hot rods, trucks, and custom builds requiring compatibility between Gen III LS engines and non-electronic automatic transmissions.