Remanufactured 8HP45/8HP-51 Transmission Planetary Gear 1101440021D for BMW 3

This is a professionally remanufactured transmission planetary gear assembly, OE part number 1101440021D, designed for the 8HP45 / 8HP-45 / 8HP-51 8-speed automatic transmission. It is compatible with BMW 3 Series F30, F35, G20, G28.5 and other vehicles equipped with the 8HP series transmission.

The planetary gear set is the core mechanical component that enables gear ratio changes in the automatic transmission. It transfers engine power through different gear combinations to achieve smooth shifts and efficient power delivery. Our remanufactured unit eliminates common issues like gear noise, slipping, harsh shifts, and premature wear caused by damaged planetary components.

Professionally Remanufactured & 100% Tested

• Fully disassembled, ultrasonically cleaned, and inspected by experienced technicians
• Worn gears, bearings, and carriers replaced with high-quality components
• Calibrated to match OEM specifications for gear mesh, backlash, and load capacity

Perfect Fit & Compatibility

• Direct fit for 8HP45 / 8HP-45 / 8HP-51 automatic transmissions
• Matches original part number 1101440021D for accurate installation, no modification required
• Compatible with BMW 3 Series F30, F35, G20, G28.5 and other 8HP-equipped models

Eliminates Common Transmission Faults

• Resolves gear whine, grinding noise, and abnormal vibration
• Fixes slipping, delayed shifts, and gear ratio errors
• Restores smooth, reliable gear changes and consistent transmission performance

Cost-Effective & Fast Support

• Remanufactured planetary gear assembly at a fraction of the new OEM price
• Competitive pricing for retail and bulk orders
• Fast delivery within 3-5 working days via global express shipping

1. Full Disassembly & Inspection: The planetary gear set is completely disassembled, and all components are inspected for wear, damage, and defects.
2. Deep Cleaning: All components are ultrasonically cleaned to remove debris, sludge, and contaminants.
3. Component Replacement: Worn gears, bearings, and carriers are replaced with high-quality replacement parts.
4. Assembly & Function Testing: The planetary gear set is reassembled and tested under simulated operating conditions to verify gear mesh, backlash, and load capacity.
5. Final Quality Control: Visual and functional inspection before packaging to ensure defect-free delivery.

• Professional Installation Required: Requires certified technicians for removal and installation with specialized tools.
• Transmission Flush Recommended: Before installation, the transmission system must be thoroughly flushed to remove any debris or old fluid.
• Fluid Recommendation: Always use the specified transmission fluid to ensure proper lubrication and planetary gear performance.

• Packaging: The planetary gear assembly is carefully secured in shockproof foam and a sturdy export carton to prevent damage during transit.
• Shipping: We support worldwide shipping via DHL, UPS, EMS, FedEx, and ocean freight.
• Lead Time: In-stock units are shipped within 3-5 working days after payment confirmation.

Guangzhou Meishun Automatic Transmission Co., Ltd. is a verified supplier specializing in automatic transmission parts. We offer a full range of AT, CVT, and DCT components including planetary gear sets, valve bodies, torque converters, and overhaul kits for various brands. We serve customers worldwide with reliable products and competitive prices.

Q1: Which vehicles does this planetary gear fit?

A1: This gear set fits vehicles equipped with the 8HP45 / 8HP-45 / 8HP-51 8-speed automatic transmission, including BMW 3 Series F30, F35, G20, and G28.5 models. Please confirm your transmission type before ordering.

Q2: Is this a new or remanufactured part?

A2: This is a professionally remanufactured planetary gear assembly, rebuilt with new components and fully tested to OEM specifications.

Q3: What issues can this gear set resolve?

A3: It fixes common transmission problems like gear whine, grinding noise, abnormal vibration, slipping, delayed shifts, and gear ratio errors caused by a faulty planetary gear set.

Q4: Do you offer bulk pricing for repair shops?

A4: Yes, we offer discounted pricing for bulk orders and long-term cooperative partners such as transmission repair shops and auto parts wholesalers. Please contact us for a custom quote.