ACDelco gear marking compound grease for ring and pinion — 10-5055 dark yellow, high-contrast, multi-purpose

ACDelco GM Original Equipment 10-5055 Multi-Purpose Compound is a dark-yellow gear-marking grease designed to visibly mark ring gear teeth so technicians can identify and adjust contact patterns accurately.

This professional-grade gear marking compound from ACDelco is formulated for high contrast and ease of use when checking ring-gear-to-pinion contact points. Its dark yellow color stands out against metal surfaces, helping mechanics and driveline specialists quickly inspect wear patterns and setup alignments during rebuilds, differential services, or gear installations. Note: Not for sale in California and certain other states; intended for professional use only.

How does this compound make ring gear inspections faster and clearer?

The compound spreads evenly across the ring gear teeth and leaves a consistent, high-contrast tracing that reveals where the pinion contacts the ring. That clear visual feedback lets technicians adjust backlash, pinion depth, and shimming with confidence. It reduces guesswork and the need for repeated trial assemblies.

• Dark yellow pigment maximizes visibility on steel gear surfaces.
• Greasy consistency adheres well without flaking or running.
• Shows continuous contact bands for precise pattern analysis.
• Suitable for multiple passes during setup and verification.

What vehicles and repair tasks is this compound suited for?

This multi-purpose marking grease works across a wide range of automotive and light truck differentials, transfer cases, and manual gearsets. It’s especially useful when rebuilding or setting up hypoid and spiral bevel gears where accurate contact patterns are critical. The formula is intended for professional shops handling drivetrain assemblies.

• Ideal for differential ring-and-pinion pattern checking.
• Useful in transfer-case and gearbox assembly verification.
• Works on both OEM and aftermarket gear components.
• Compatible with typical workshop solvents for cleanup.

How do you apply and remove the marking grease safely?

Apply a thin, even coat to several teeth on the ring gear, rotate the pinion slowly under load or with a seating tool, then inspect the contact band left by the pinion. Remove excess with a suitable solvent and clean rag before final assembly. Follow shop safety practices and local regulations for handling and disposal.

• Use a brush or gloved finger for a controlled, thin layer.
• Rotate gears under controlled torque to produce an accurate trace.
• Clean with approved solvents; avoid contamination of bearings and seals.
• Observe all professional safety and environmental procedures.

Are there usage limitations or regulatory notes I should know?

This product is labeled for professional use only and is restricted from sale in California and certain other jurisdictions. It contains substances subject to local safety warnings; handle in ventilated areas and use appropriate PPE. Do not use the compound as a permanent lubricant—it’s intended only for pattern-marking and inspection tasks.

• Not for retail sale in California and other specified states.
• For professional/service-shop use; follow workplace regulations.
• Not a substitute for assembly lubricants or operational greases.
• Dispose of residues per local hazardous-waste guidelines.

Who is this for: ACDelco GM Original Equipment 10-5055 Multi-Purpose Compound is made for professional mechanics, driveline rebuilders, and service technicians who need a reliable, high-visibility marking grease to set and verify ring-and-pinion contact patterns. If you rebuild differentials, perform final gear setups, or routinely troubleshoot gear noise and wear, this compound streamlines inspection work and improves adjustment accuracy.