Chelhead LS Flywheel Locking Tool for GM RWD LS/LT Engines — Black Oxide 1/4" Steel

Chelhead's LS Flywheel Locking Tool is a heavy-duty crankshaft holder that secures the flywheel or flexplate ring gear on rear-wheel-drive GM LS and select LT engines for safe, accurate high-torque service.

This precision-made tool makes many common engine jobs easier and safer by locking the crankshaft in place so you can remove or tighten the harmonic balancer bolt, service the flywheel or flexplate, and torque components without the crank turning. Built from 1/4-inch cold-rolled USA steel and finished in black oxide, the holder installs at the starter mounting location and uses two included grade 8.8 bolts for a straightforward, repeatable fit on numerous 1997–2019 GM RWD LS and LT V8 platforms.

How does this tool attach to my LS or LT engine?

Installation is simple: remove the starter and position the tool over the starter’s bolt holes. The tool mates to the starter mounting location and the locking tab engages ring-gear teeth to prevent crank rotation.

• Uses the starter mounting location—no separate crank fixture required
• Includes two proper-length grade 8.8 bolts for secure mounting
• Fits both manual and automatic RWD bellhousings (not for FWD)

Which engines and models will this holder work with?

The Chelhead locking tool is designed for a wide range of rear-wheel-drive GM V8 engines produced between 1997 and 2019. It accommodates many LS-family and select Gen V LT engines found in cars and trucks.

• Compatible with LS1, LS2, LS3, LS6, LSX and common 4.8L–7.0L variants
• Also fits select Gen V LT1, LT4, L83 and L86 engines
• Confirm RWD layout and starter location before ordering

Can it withstand high-torque service and shop use?

Yes — the tool is built for workshop demands. Cold-rolled 1/4-inch steel construction and TIG welding provide rigidity during heavy torque operations while the black oxide finish reduces surface corrosion from repeated use.

• 1/4-inch USA steel body for torsional strength
• TIG-welded seams improve durability under load
• Black oxide finish protects against rust and wear

Will this work on engines on a stand as well as in the vehicle?

The design supports both engine-stand and in-vehicle use on compatible rear-drive setups. It clears common bellhousing profiles and secures the flywheel or flexplate so you can perform torque-sensitive tasks on either mount.

• Intended for engines mounted in-vehicle or on an engine stand
• Engages ring-gear teeth—no crankshaft puller required during service
• Packaged with one tool and two mounting bolts for immediate use

Who is this for? Automotive technicians, home mechanics and engine builders who work on rear-wheel-drive GM LS and select LT V8 engines will find this Chelhead flywheel locking tool valuable for safely holding the crankshaft during high-torque procedures. If you routinely remove harmonic balancer bolts, service flywheels or flexplates, or perform engine rebuilds on compatible RWD GM V8s, this tool speeds work, reduces risk of crank rotation, and provides a reliable, workshop-grade holding solution. Always verify your engine variant and starter mounting layout to ensure compatibility before purchase.