Red Line V-Twin Gear Oil with SHOCKPROOF® - 946ml • 42834

Red Line 42834 V-Twin Transmission Oil with ShockProof® - 946ml

Specialist Red Line transmission lubricant for V-Twin motorcycles with separate transmission cases, including supported Harley-Davidson and aftermarket transmissions listed in the compatibility table.

V-Twin Transmission Oil with ShockProof® is a full-synthetic transmission lubricant developed specifically for motorcycle gearboxes where the engine and transmission use separate lubrication systems.

Red Line states that the formulation helps dampen transmission noise and the characteristic shifting clunk found in many V-Twin gearboxes. It also helps reduce transmission operating temperature, provides a thicker lubricating film between gear teeth and resists lubricant throw-off under demanding operating conditions.

The lubricant uses Red Line's ShockProof® technology and is based on the same fluid as Heavy ShockProof® Gear Oil. Confirmed applications include Harley-Davidson transmissions using Milwaukee-Eight, Evolution and Twin Cam engines, later 6-speed Cruise Drive transmissions and supported aftermarket gearboxes from Baker, JIMS and S&S.

• Product type: Full-synthetic motorcycle transmission lubricant
• Product range: V-Twin / ShockProof®
• Primary use: Separate-case V-Twin motorcycle transmissions
• Location / system: Motorcycle transmission / gearbox
• Brand: Red Line Synthetic Oil
• Product reference / SKU: 42834
• Container size: 946ml / 1 US quart
• Transmission type: Separate transmission case
• Application: Harley-Davidson Milwaukee-Eight transmissions
• Application: Harley-Davidson Evolution transmissions
• Application: Harley-Davidson Twin Cam transmissions
• Application: Harley-Davidson 6-speed Cruise Drive transmissions
• Aftermarket transmission applications: Baker, JIMS and S&S where supported
• Formulation note: Same fluid as Red Line Heavy ShockProof® Gear Oil

Fitment advice: This product is intended for V-Twin motorcycles with a separate transmission case. It should not be treated as a general motorcycle engine oil or as a universal lubricant for combined engine-and-gearbox wet-clutch systems unless specifically supported for that application.

Other items to consider: When servicing a separate motorcycle transmission, you may also want to consider replacement drain and fill plug seals, gearbox inspection covers or gaskets, related primary-drive lubricant and suitable service consumables.

Useful tools / consumables: Drain pan, suitable sockets or spanners, torque wrench, fluid transfer funnel or bottle, gloves, workshop towels and brake cleaner for external clean-up.

Difficulty guide: DIY Difficulty: Easy to Moderate. Routine gearbox oil replacement is straightforward on most separate-case V-Twin transmissions, but correct drain, fill and oil-level procedures should be followed.

Why Red Line? Red Line Synthetic Oil is known for high-performance lubricants, fluids and additives developed for demanding road, track and motorsport use. Red Line products are chosen by enthusiasts and workshops for their focus on protection, thermal stability, shift quality, friction control and application-specific performance.

What’s in the bottle: One 946ml / 1 US quart bottle of Red Line V-Twin Transmission Oil with ShockProof®.

Service notes: Drain the existing transmission lubricant and refill the separate transmission case to the motorcycle or transmission manufacturer's specified level. This product is specifically formulated for supported separate-case V-Twin transmissions rather than combined engine/transmission lubrication systems.