LS Crank Sleeve Adapter Bolt Set Demfec Heavy Duty

Description

Product Overview

The Demfec LS Crank Sleeve Adapter Bolt Set is engineered for durability and precision. Constructed from high‑grade alloy steel, each bolt meets Grade 8 hardness standards and features a 12‑point hex head for easy installation. The set includes eleven pieces: one crank sleeve adapter, six Gen III LS flexible board bolts, three torque converter bolts, and additional components to complete the conversion. Thread specifications are UNC 7/16‑20 with a 1A class, ensuring a secure right‑hand fit for a wide range of LS engines.

Usage

Designed for 1997‑2009 GM LS1/LS2/LS6 engines and compatible 4.8/5.3/6.0 truck powerplants, this adapter kit simplifies the transition to TH350, TH400, or 4L80E transmissions. Ideal for performance shops, rebuild projects, and DIY enthusiasts, the kit works with existing factory LS starters, reducing parts inventory and labor time.

Why Choose Us

Demfec combines automotive engineering expertise with rigorous quality control. Each bolt undergoes heat treatment to achieve Grade 8 hardness, guaranteeing resistance to stretch and shear under high torque conditions. The machined exterior finish resists corrosion, while the precise threading eliminates the need for additional adapters. Our comprehensive kit eliminates guesswork, providing every component needed for a seamless conversion.

Key Features

• Heavy‑duty alloy steel construction meets Grade 8 hardness for maximum strength.
• Precise 7/16‑20 UNC threading with 12‑point hex head ensures easy, secure installation.
• Complete 11‑piece kit includes all bolts and adapters needed for LS to TH350/TH400/4L80E swaps.
• Wide compatibility with 1997‑2009 GM LS engines and 4.8/5.3/6.0 truck engines.
• Cost‑effective solution that utilizes existing factory LS starter components.

FAQ

Is this kit compatible with 1999‑2000 LQ4 engines?

No, the kit is not compatible with 1999‑2000 LQ4 6.0 LS engines that use a 4L80E transmission, as they require a flat flexible board due to a taller crank flange.

What size are the bolts?

All bolts are 7/16″‑20 UNC with a 1A thread class, featuring a 12‑point hex head and meeting Grade 8 hardness specifications.

Can this kit be used for both performance and daily‑driven vehicles?

Yes, the heavy‑duty construction provides the strength needed for high‑performance applications while remaining reliable for everyday driving conditions.

Do I need additional tools to install the kit?

A standard 12‑point socket and torque wrench are sufficient for installation; no special tools are required.

What is included in the package?

The package contains one replacement transmission adapter flexible board, six Gen III LS flexible board bolts, one LS crank socket adapter, and three torque converter bolts, totaling eleven pieces.