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Product Details
The Honda OEM K-Series Manual Transmission Mainshaft Needle Bearing is a genuine factory replacement designed to provide smooth gear rotation, precise shaft support, and dependable performance in compatible Honda and Acura manual transmissions.
Manufactured to Honda's original equipment specifications, this precision-engineered needle roller bearing measures 39mm x 44mm x 24mm and is designed for the mainshaft assembly in select K-Series manual transmissions.
Commonly used in vehicles such as the 2002–2006 Acura RSX Type-S, 2004–2014 Acura TSX, and 2013–2015 Acura ILX equipped with compatible 6-speed manual transmissions, this genuine Honda bearing is an excellent replacement for worn or damaged factory transmission components.
Needle roller bearings utilize cylindrical rollers to provide rotational support within a compact space. This design allows transmission gears to rotate smoothly while maintaining proper support under changing drivetrain loads.
Over time, needle bearings can develop wear from high mileage, contaminated transmission fluid, excessive drivetrain loads, or aggressive driving. A worn mainshaft needle bearing may contribute to abnormal transmission noise, rough gear rotation, or accelerated wear of surrounding gearbox components.
Whether you're rebuilding an Acura RSX Type-S 6-speed transmission, refreshing a high-mileage K-Series gearbox, or preparing a Honda drivetrain for a performance build, this genuine Honda OEM Mainshaft Needle Bearing provides factory-correct dimensions and dependable construction.
Features
- Genuine Honda OEM Part: Authentic factory replacement manufactured to Honda's original equipment specifications.
- Mainshaft Needle Bearing: Designed for the mainshaft assembly in compatible Honda and Acura manual transmissions.
- Needle Roller Bearing Construction: Uses cylindrical rollers to provide smooth rotational support in a compact assembly.
- 39mm Inner Diameter: Factory-specified bearing inside diameter.
- 44mm Outer Diameter: Designed to match the corresponding transmission component.
- 24mm Width: Maintains the original factory bearing dimensions.
- Direct OEM Replacement: Replaces the original bearing where Honda specifies part number 91102-RZF-006.
- Factory-Correct Fit: Maintains the intended bearing geometry and shaft support.
- Smooth Gear Rotation: Helps minimize friction between compatible rotating transmission components.
- Ideal for Transmission Rebuilds: Excellent for K-Series manual transmission maintenance and rebuilding.
- Performance Build Friendly: Suitable for compatible naturally aspirated, turbocharged, and supercharged K-Series drivetrain projects.
- OEM Supersession: Replaces Honda part numbers 91102-PPP-006, 91102-PPP-016, and 91102-RPN-006.
- Sold Individually: Includes one genuine Honda mainshaft needle bearing.
- OEM Part Number: 91102-RZF-006.
Additional Information
- Manufacturer: Honda / Acura
- Part Number: 91102-RZF-006
- OEM Description: Bearing, Needle (39x44x24)
- Other Names: Mainshaft Needle Bearing / Manual Transmission Needle Bearing / Mainshaft Gear Bearing / K-Series Transmission Bearing
- Product Type: Manual Transmission Bearing
- Installation Location: Mainshaft Assembly
- Bearing Type: Needle Roller Bearing
- Inner Diameter: 39mm
- Outer Diameter: 44mm
- Width: 24mm
- Replaces: 91102-PPP-006, 91102-PPP-016, 91102-RPN-006
- Quantity: Sold Individually (1 Bearing)
Common Reasons for Replacement
Manual transmission needle bearings should be inspected whenever the gearbox is disassembled for maintenance or rebuilding.
- Abnormal transmission whining or grinding noises
- Rough or noisy gear rotation
- Worn or damaged needle rollers
- Pitting or deterioration of bearing surfaces
- Excessive wear of the associated gear or shaft
- Contaminated or insufficient transmission fluid
- High-mileage transmission rebuilding
- Gear or synchronizer replacement
- K-Series transmission restoration
- Performance transmission assembly
- Replacing a worn mainshaft needle bearing helps restore proper rotational support and may prevent additional damage to surrounding transmission components.
Installation Notes
- Proper installation is essential for maintaining correct gear alignment, bearing performance, and transmission operation.
- Before installation, inspect the mainshaft, associated gears, bearing contact surfaces, and surrounding transmission components for wear or damage.
- Confirm that the replacement needle bearing matches the original component's dimensions and specifications.
- Clean the bearing installation area and remove any accumulated debris or contaminated lubricant.
- Important: Needle roller bearings must be installed and lubricated according to the Honda factory service manual. Avoid damaging the rollers or bearing cage during installation.
- Inspect related transmission bearings, synchronizers, gears, and shaft components while the gearbox is disassembled.
- Follow the Honda factory service manual for the correct installation procedures, transmission clearances, and reassembly specifications.
- After reassembly, refill the transmission with the manufacturer-specified manual transmission fluid and verify proper operation.
Note:
- Includes one genuine Honda OEM Mainshaft Needle Bearing (39x44x24mm). Transmission gears, shafts, synchronizers, collars, and additional bearings are sold separately unless otherwise specified.
For Honda and Acura enthusiasts rebuilding a K-Series manual transmission, restoring a factory drivetrain, or preparing a performance gearbox, this genuine Honda OEM Mainshaft Needle Bearing delivers factory-correct dimensions, smooth rotational support, and dependable transmission performance.
| Part Number: | 91102-RZF-006 |
| Brand: | Honda |
WARNING: This product may contain chemicals known to the State of California to cause cancer or birth defects. www.P65Warnings.ca.gov.
Vehicle Fitment
This part does not have vehicle specific fitment. Please contact us if you need assistance.
1 Reviews ★★★★★
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Jeremy gibson | January 9th, 2026
Exactly the genuine part I ordered than you!!!!
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