MateAuto Transmission Mainshaft Inner Bearing Race Tool for Harley‑Davidson Big Twin 5/6‑Speed — Puller & Installer

MateAuto's Transmission Mainshaft Inner Bearing Race Tool is a dual-purpose puller and installer built specifically for Harley-Davidson Big Twin 5- and 6-speed transmissions (1984–present).

This precision toolset replaces the older #34902-84 style puller and provides a dedicated, durable solution for removing and pressing the mainshaft inner bearing race without harming surrounding transmission components. Forged carbon steel, heat-treated parts and protective surface finishes make the kit durable in shop environments, while its compact design helps reach tight spaces in motorcycle transmissions. The set ships in a protective storage case so every piece stays organized and ready for service work or home repairs.

How does the MateAuto tool remove the inner bearing race safely?

The tool converts the removal procedure into a controlled mechanical action that extracts the inner bearing race without levering against delicate transmission cases or shafts. Its contact points and fitment mimic OEM pullers but offer a simplified, stronger build to reduce the risk of slippage or component damage.

• Engineered contact surfaces align with the bearing race to distribute force evenly.
• Forged carbon steel construction resists bending under extraction loads.
• Compact geometry allows extraction in constrained transmission cavities.

Can the same components also install a replacement bearing race?

Yes — the kit doubles as an installer, allowing you to press the new bearing race into position with controlled, even pressure. This two-in-one function eliminates the need for separate tools and reduces the chance of misalignment during installation.

• Installer adapters center the race for a straight, square press.
• Threaded forcing elements apply uniform force to prevent seating damage.
• Multiple contact sleeves accommodate standard OEM race profiles.

What materials and finishes protect the tool for long-term use?

The set is forged from carbon steel and goes through heat treatment for strength and toughness. Surface treatments — a black oxide finish combined with phosphating — add corrosion resistance and a harder working surface that stands up to shop fluids and repeated use.

• Heat-treated carbon steel for high fatigue resistance.
• Black oxide coating reduces surface corrosion and glare.
• Phosphate treatment improves lubricant retention and wear resistance.

How practical is the kit for mechanics and home enthusiasts?

The compact and organized kit is built for real-world service: it fits in tight transmission bays, stores neatly in its case, and brings the specific adapters needed for Harley Big Twin mainshaft races. Both professional shops and DIYers will find it reduces job time and tool clutter compared with improvised methods.

• Compact components reach confined spaces in transmission assemblies.
• Sturdy storage case keeps parts organized and protected between jobs.
• Replaces older puller #34902-84 for a modern, dedicated solution.

Who this is for: This MateAuto bearing race puller/installer is tailored to technicians and motorcycle owners who service Harley-Davidson Big Twin 5- and 6-speed transmissions (models 1984 to present). If you need a purpose-built toolset that reduces risk to transmission parts, speeds up bearing race swaps, and stores neatly between uses, this kit gives a professional-grade option without resorting to jury-rigged methods.