The rear halfshaft is the critical link between your Tesla's drive unit and rear wheels, translating electric motor torque into smooth, responsive motion. The 1188165-99-A Halfshaft Assembly—engineered for Tesla Model Y (2021-present)—delivers this power with surgical precision, thanks to its 28mm diameter and 580mm length that perfectly match the vehicle's drivetrain geometry.
Unlike traditional ICE vehicle halfshafts, this assembly is optimized for the instant torque delivery of Tesla's electric motors. The 28mm alloy steel shaft—3mm larger than earlier 25mm versions—handles the higher torque loads of dual-motor configurations while maintaining a 15% weight advantage over comparable steel shafts. Its precision-machined splines ensure zero backlash during acceleration or regenerative braking, eliminating the "clunk" common in aftermarket alternatives.
Equipped with dual Constant Velocity (CV) joints, the assembly maintains consistent power transfer even at full steering lock. The outer joint features a heat-resistant neoprene boot filled with high-temperature molybdenum grease, tested to withstand -40°C to 120°C operating ranges. This 密封设计 (sealed design) prevents contamination from road salt, mud, and water—critical for preserving performance in harsh climates. Each joint undergoes 10,000+ rotation cycles at max load during quality testing, ensuring 150,000+ km service life.
Designed for both left and right rear positions, this assembly simplifies inventory and replacement. Installation follows Tesla's exacting standards:
- Torque axle nut to 245 Nm using a 32mm socket
- Apply Molykote M-77 paste to hub mating face (avoid splines)
- Use new lock washers (included) to prevent loosening under vibration
Professional technicians can complete replacement in under 90 minutes, leveraging existing mounting points without modifications.
A worn halfshaft manifests in symptoms like vibration under acceleration, clicking during turns, or uneven power distribution—all of which compromise efficiency and safety. This assembly restores:
- Smooth power delivery across all speed ranges
- Proper torque vectoring during cornering
- Optimal regenerative braking performance
- Reduced drivetrain noise (3dB quieter than worn units)
Backed by a 24-month warranty, 1188165-99-A is certified to meet Tesla's strict durability standards, including 500 hours of salt spray testing and 100,000km road simulation.
Priced at approximately 15,195 SEK (OEM equivalent), this halfshaft represents a cost-effective alternative to dealership replacements while maintaining OE quality. For Model Y owners seeking to preserve their vehicle's performance and resale value, it's the only choice that balances strength, precision, and electric drivetrain optimization.
Ensure your Tesla continues to deliver that signature instant acceleration and silent operation. Choose 1188165-99-A—where engineering meets electric performance.
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Tesla Model Y Rear Halfshaft Assembly 28mm x 580mm 1188165-99-A Images
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