Product details
  • SKU QMCSQ0007

OUSIMY Rear Differential Viscous Coupler Coupling for Toyota Sienna2.7L3.5L2011-2018|0E 41303-08020

In stock
Usually ships within 24 hours
Regular price $299.99
Product details
  • Vendor OUSIMY SHOP
  • SKU QMCSQ0007
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Fast & Reliable Shipping:

We understand that vehicle repairs cannot wait.

All OUSIMY orders are processed within 24 business hours after payment confirmation.

Shipping Options:

• Standard Shipping:
Delivery usually takes 7-15 business days depending on destination.

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Warranty Policy:

At OUSIMY, we stand behind the quality and reliability of our automotive parts.

All products include a 3-Year Limited Warranty.

The warranty covers:
• Manufacturing defects
• Product quality issues
• Failures under normal use conditions


If you experience any product issue, please contact our support team. We will provide assistance including troubleshooting, replacement, or other solutions.

Warranty does not cover:
• Incorrect installation
• Damage caused by accidents
• Improper use
• Normal wear and tear

30-Day Money-Back Guarantee:

Your satisfaction is important to us.

If you are not completely satisfied with your purchase, you can request a return within 30 days after receiving your order.

Return requirements:

• Product must be unused
• Product must be in original condition
• Original packaging should be included


If you receive an incorrect or defective item, please contact us first. Our team will help resolve the issue as quickly as possible.

Vehicle Fitment & Technical Support:

Not sure if this part fits your vehicle?

Our automotive support team is here to help you find the correct replacement part before placing your order.

We can assist with:

✓ Vehicle compatibility confirmation
✓ OEM / Part number verification
✓ Product selection assistance
✓ Installation questions


To help us confirm the correct fitment, please provide:

• Vehicle Make & Model
• Year
• Engine Type
• OEM Part Number (if available)
• VIN Number (optional)


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Click the chat icon in the bottom right corner and send us your vehicle information. Our team will help verify compatibility and recommend the correct replacement solution.

OE Part Number: 41303-08020

Specification Details
Condition New: A brand-new, unused, unopened, undamaged item in its original packaging (where packaging is applicable). Packaging should be the same as what is found in a retail store, unless the item was packaged by the manufacturer in non-retail packaging, such as an unprinted box or plastic bag. See the seller's listing for full details. 
Manufacturer Warranty 3 Years
Manufacturer Part Number 41303-28013, 4130328013
Placement on Vehicle Rear
Color Silver
OE/OEM Part Number 41303-28013, 41303-28011, 41303-28012
Country of Origin China
Brand OUSIMY
Type Differential
Interchange Part Number 41303 28013, 4130328011, 4130328012, 41303-28011, 43303-28012
Fitment Type Direct Replacement
UPC Does not apply
Fitment For 2011-2018 Toyota Sienna AWD 2.7L 3.5L


This rear differential viscous coupler coupling serves as a core AWD torque transfer component, specially designed as a direct replacement for the 2011-2018 Toyota Sienna 2.7L and 3.5L all-wheel-drive models. It precisely regulates power distribution between the front and rear axles, stabilizing AWD operation and eliminating inconsistent power output caused by worn factory units.
Crafted with premium die-cast aluminum housing, high-temperature resistant internal viscous fluid, and multi-layer fluorine rubber sealing rings, this viscous coupler delivers outstanding structural rigidity and aging resistance. It installs directly on the rear differential driveline of AWD Toyota Sienna. All mounting dimensions, internal spline specifications and assembly interfaces fully comply with OEM factory standards, supporting plug-and-play installation for all 2.7L and 3.5L Sienna AWD vehicles from 2011 to 2018 without any modification.
Different from original factory couplings that suffer from fluid attenuation, seal aging and performance degradation after long-term highway and daily driving, this upgraded viscous coupler adopts optimized fluid formula and thickened anti-leak seal structure. It effectively resists high-temperature oxidation and pressure loss, greatly extending service life and improving overall system stability. The unit comes fully pre-assembled and pre-tested before shipment, requiring no professional calibration or fluid filling, which greatly reduces installation difficulty for both repair shops and DIY replacement.
This replacement coupling solves the most common inherent faults of aging Toyota Sienna AWD systems. It effectively fixes low-speed turn shudder, rear driveline humming and grinding noise, delayed AWD engagement on slippery roads, rear differential oil seepage, and weak torque transfer that leads to frequent replacement of stock parts and increased maintenance costs.
It resolves mainstream OBD diagnostic trouble codes triggered by failed viscous couplers, including AWD system performance error codes and rear driveline torque distribution malfunctions detected by standard automotive scan tools.
We provide free standard shipping for all orders across the United States. All in-stock products are shipped within 1 business day after payment confirmation, dispatched directly from our local US warehouse with complete tracking information to ensure fast and transparent delivery.
Every OUSIMY rear differential viscous coupler is backed by a 2-year limited manufacturer warranty against factory defects. The installation process fully matches official Toyota service guidelines, allowing experienced vehicle owners to complete independent DIY replacement and save expensive dealership labor fees.
Full Compatible Vehicle List
Toyota Sienna AWD 2.7L 2011
Toyota Sienna AWD 3.5L 2011
Toyota Sienna AWD 2.7L 2012
Toyota Sienna AWD 3.5L 2012
Toyota Sienna AWD 2.7L 2013
Toyota Sienna AWD 3.5L 2013
Toyota Sienna AWD 2.7L 2014
Toyota Sienna AWD 3.5L 2014
Toyota Sienna AWD 2.7L 2015
Toyota Sienna AWD 3.5L 2015
Toyota Sienna AWD 2.7L 2016
Toyota Sienna AWD 3.5L 2016
Toyota Sienna AWD 2.7L 2017
Toyota Sienna AWD 3.5L 2017
Toyota Sienna AWD 2.7L 2018
Toyota Sienna AWD 3.5L 2018