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Your items may arrive sooner than the estimated delivery date. Ralph Lauren reserves the right to send packages via other shipping methods based on the shipping destination as long as orders will still arrive within the arrival times outlined on RalphLauren.com.
When you choose the Economy delivery option, packages are delivered Monday through Saturday 8 AM to 4:30 PM. Orders sent by Fast, 2-Business-Day or Next-Day shipping methods are delivered Monday through Friday from 8 AM to 4:30 PM.
We recommend choosing Fast or Next-Day delivery if you are shipping your package to a business address. You will be asked to provide a telephone number on the shipping page of checkout, which is important in the event the courier needs to arrange a delivery time with you.
You will also be asked to provide an email address, to which we will send confirmation that your order was placed.
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Begin by removing the damaged or worn Rear Portal Housing (Part No. 21001) from the YIKONG YK4107 RC Car. Check the internal gears, bearings, and related components, and replace any worn parts if necessary.
Transfer the original gears, bearings, and other internal components into the new rear portal housing. Reassemble everything according to the factory layout and secure the housing with the original screws. Pay attention to the orientation and position of each part to ensure proper gear engagement.
Once assembled, manually rotate the wheels to verify smooth drivetrain operation. A short low-speed test is recommended to confirm that the rear axle functions correctly before returning the YIKONG YK4107 RC Car to normal use.
In addition, we also offer upgraded metal front and rear portal housings for the YIKONG YK4107 RC Car. Compared with the stock plastic housings, the metal versions provide greater strength and durability, making them better suited for crawling, off-road driving, and demanding terrain. They can withstand higher impact and drivetrain loads while also enhancing the overall appearance and scale realism of the vehicle, making them a popular upgrade choice among RC enthusiasts.


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