Jetuplusllc LS/LT Crank Holding Tool — Heavy-Duty Powder-Coated Aluminum for Gen III–V

Jetuplusllc's LS/LT Heavy Duty Flywheel Flexplate Crank Holding Tool secures the crank while you remove or install balancers, flywheels, and torque converters on all GM Gen III–V LS engines.

This machined aluminum crank-holding tool is designed to mount to the starter bolt flange, giving a sturdy, repeatable anchor point during engine service. Powder-coated for corrosion resistance and supplied with mounting bolts, it fits across the LS family (Gen III, IV and V) so you can use one tool for multiple engine builds and repairs. It eliminates the need for improvised holding methods and reduces the risk of slippage when torquing or loosening crank-related fasteners.

How does this tool attach to LS engines?

The holder mounts to the starter bolt flange using the included hardware, aligning with factory starter locations for a direct fit. Its design works with common LS starter layouts so installation is fast and secure.

• Attaches to starter bolt flange for a rigid anchor point
• Includes two mounting bolts sized for starter flange holes
• Works with standard LS starter geometry across Gen III–V

What jobs does the crank holding tool help with?

Use it whenever the crank must be restrained: removing or installing harmonic balancers, flywheels, flexplates, and torque converters. It holds the crank steady so you can safely apply rated torque to fasteners without risking damage or injury.

• Balancers and harmonic dampers: prevents crank rotation during removal/installation
• Flywheel/flexplate work: stabilizes crank when torquing bolts
• Torque converter and transmission service where crank restraint is required

Will it fit my engine and what are the materials and finish?

This tool is compatible with all GM Gen III, IV, and V LS engines—covering standard LS, LS-based truck and LT variants. It's CNC-machined from aluminum for strength with a powder-coated finish for durable surface protection.

• Material: machined aluminum for stiffness and low weight
• Finish: powder-coated to resist corrosion and workshop wear
• Compatibility: all LS engines across Gen III–V families

What comes in the package and how do I use it safely?

The package includes one holding tool and two mounting bolts to secure it to the starter flange. Follow basic safety: block engine rotation, use proper torque values, and confirm the tool seats flush before applying force.

• Package contents: 1 holding tool, 2 mounting bolts
• Pre-install: verify starter flange threads and bolt length
• Usage tip: hand-start bolts, then tighten to recommended clamp values

Who is this for? Professional mechanics, performance builders, and DIY enthusiasts who service LS-series engines will appreciate the repeatable positioning and robust hold this tool provides. It’s especially useful for engine swaps, rebuilds, and transmission jobs where precise crank restraint saves time and prevents fastener damage. If you work regularly on GM LS/LT platforms and need a reliable, engine-specific holding tool that mounts to the starter flange, the Jetuplusllc LS/LT Heavy Duty Flywheel Flexplate Crank Holding Tool is a practical addition to your toolset.