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.
