Description

Quick Change Gear Set – 8500 Series – Set 21 – 10 Spline – 4.12 Ratios 6.29 / 2.70 – 4.86 Ratios 7.41 / 3.18 – Steel – Polished – Each

Why Choose Us?



Frequently Asked Questionsโ€‹

As an Authorized Automotive Retailer in the United States, we take pride in guaranteeing 100% authentic products from all brands available on our website. With partnerships spanning 1,000+ brands and a network of 20+ distributor warehouses nationwide, we maintain millions of auto parts in inventory across the USA, ensuring quick shipping and reliable service to our customers. When you shop with us, you're investing in quality and trust.
We believe we have the fastest backorder system in the U.S. auto parts industry, thanks to our strong partnerships with brands and vendors.Nearly all backordered auto parts are shipped directly by the vendors without any additional delays, or they are placed as special orders on the same day. In most cases, backordered parts are delivered within 5-10 days.
We offer unbeatable prices and the best shipping rates on auto parts, with exclusive protection and insurance included to safeguard your order from damage or loss. Enjoy convenient door-to-door delivery, real-time tracking, and our 100% satisfaction guarantee for a smooth, worry-free experience.
Our standard shipping typically takes 1-3 business days. We will provide estimated shipping time for each product. While we aim to deliver as quickly as possible, this timeframe ensures all orders are processed, prepared, and dispatched with care. If the products are not ready for shipping in 72 hours, we will refund you 100%
Absolutely. Once your order is dispatched, youโ€™ll receive an email with tracking details, so you can follow your shipment every step of the way. Every step of shipping process will be sent through email notifications or using tracking page.
Every product page includes a stock level indicator to show whatโ€™s available. We always update the inventory 24/24. Weโ€™ll be happy to check availability and provide updates on new stock arrivals if you need a help.
Weโ€™re sorry to hear that your order wasnโ€™t delivered in perfect condition. Please email us with your order number, a description of the issue, and photographs of the damaged item. Once we receive this information, weโ€™ll arrange for a replacement or refund and handle the return process.
You can return items within 30 days of receipt. Ensure the product is new in its original packaging and securely wrapped for safe transit. Once we receive the item in sellable condition, weโ€™ll issue a full refund for the product value. Contact us for the return address and further instructions.

About WINTERS

For more than 60 years, Winters Performance Products has been producing high-performance rear ends and driveline components for racing and street use. Their product offering includes everything from quick-change gear sets to shifter assemblies, as well as many components specifically for the sprint car market.

International Shipping

Below are estimated rates and delivery times for popular destinations; full carrier options are available at checkout.

Our dedicated team has years of experience managing international logistics and customs documentation to ensure smooth delivery from our US warehouse to your door. Please review our shipping policy and local import regulations before ordering.

Loading international estimates...

Reviews

There are no reviews yet.

Be the first to review “WINTERS Quick Change Gears 8521”

Your email address will not be published. Required fields are marked *

Recently viewed products

  • Add to wishlist
    Sale
    Wheel Front Aftermarket Shop
    Add to wishlist

    PERTRONIX IGNITION Ignitor Conversion Kit 1441A

    SKU: PRT1441A
    Product information
    • Weight0.4 lbs
    • Dimensions6.2 × 4.85 × 1.75 in
    • Product Line

      Ignitor

    • Trigger Method

      Magnetic

    • Voltage

      12V

    • Positive / Negative Ground

      Negative

    • Quantity

      Kit

    Details...
    Original price was: $182.00.Current price is: $165.24.Add to cart
    Original price was: $182.00.Current price is: $165.24.
    Quantity Only 5 left in stock!
    -+
    Add to cart
    Add to wishlist
  • Add to wishlist
    Sale
    Wheel Front Aftermarket Shop
    Add to wishlist

    PERTRONIX IGNITION Ignitor Conversion Kit ML-186B

    SKU: PRTML-186B
    Product information
    • Weight0.2 lbs
    • Dimensions6.15 × 4.85 × 1.7 in
    • Product Line

      Ignitor

    • Trigger Method

      Magnetic

    • Voltage

      12V

    • Positive / Negative Ground

      Negative

    • Advance Type

      Vacuum

    Details...
    Original price was: $173.00.Current price is: $157.01.Add to cart
    Original price was: $173.00.Current price is: $157.01.
    Quantity Only 3 left in stock!
    -+
    Add to cart
    Add to wishlist
  • Add to wishlist
    Sale
    Wheel Front Aftermarket Shop
    Add to wishlist

    QA1 Stocker Star Shock – Adjustable TS705

    SKU: QA1TS705
    Product information
    • Weight3.77 lbs
    • Dimensions19.2 × 3.9 × 3.6 in
    • Product Line

      Stocker Star Single Adjustable

    • Internal Design

      Twintube

    • Gas/Hydraulic

      Hydraulic

    • Rebuildable

      Yes

    • Stroke Length

      5 in

    Details...
    Original price was: $236.45.Current price is: $214.95.Add to cart
    Original price was: $236.45.Current price is: $214.95.
    Quantity Only 2 left in stock!
    -+
    Add to cart
    Add to wishlist
  • Add to wishlist
    Sale
    Wheel Front Aftermarket Shop
    Add to wishlist

    QA1 Stocker Star Shock – Adjustable TS706

    SKU: QA1TS706
    Product information
    • Weight4.15 lbs
    • Dimensions19.1 × 3.9 × 3.7 in
    • Product Line

      Stocker Star Single Adjustable

    • Internal Design

      Twintube

    • Gas/Hydraulic

      Hydraulic

    • Rebuildable

      Yes

    • Stroke Length

      7.25 in

    Details...
    Original price was: $236.45.Current price is: $214.95.Add to cart
    Original price was: $236.45.Current price is: $214.95.
    Quantity Only 3 left in stock!
    -+
    Add to cart
    Add to wishlist
  • Add to wishlist
    Sale
    Wheel Front Aftermarket Shop
    Add to wishlist

    MSD IGNITION Ford Complete Kit 8414

    SKU: MSD8414
    Product information
    • Weight1.1 lbs
    • Dimensions6.2 × 5.5 × 5.4 in
    • Terminal Style

      HEI

    • Internal / External Coil

      External Coil

    • Vented / Non-Vented

      Vented

    • Mounting Method

      Clamp Down

    • Wire Hold Down Included

      Yes

    Details...
    Original price was: $99.00.Current price is: $89.15.Add to cart
    Original price was: $99.00.Current price is: $89.15.
    Quantity Only 6 left in stock!
    -+
    Add to cart
    Add to wishlist
  • Add to wishlist
    Sale
    Wheel Front Aftermarket Shop
    Add to wishlist

    MELLING Screen Assembly 57-S1

    SKU: MEL57S1
    Product information
    • Weight0.825 lbs
    • Dimensions8 × 6.1 × 5.1 in
    • Inlet Diameter

      0.5 in

    • Mounting Style

      Bolt On

    • Internal/External

      Internal

    • Color

      Natural

    • Finish

      Natural

    Details...
    Original price was: $41.15.Current price is: $37.41.Add to cart
    Original price was: $41.15.Current price is: $37.41.
    Quantity Only 4 left in stock!
    -+
    Add to cart
    Add to wishlist
  • Add to wishlist
    Sale
    Wheel Front Aftermarket Shop
    Add to wishlist

    SCHOENFELD Header Tab Kit 768197

    SKU: SCH4003-4
    Product information
    • Weight0.495 lbs
    • Dimensions4.9 × 3.35 × 1.25 in
    • Quantity

      Set of 4

    • Variant

      Yes

    • Variant Group

      HeaderTabsandTethers2

    • Variant Column

      Quantity

    • Washers Included

      Yes

    Details...
    Original price was: $21.60.Current price is: $19.64.Add to cart
    Original price was: $21.60.Current price is: $19.64.Add to wishlist
  • Add to wishlist
    Sale
    Wheel Front Aftermarket Shop
    Add to wishlist

    VENTSHADE Window Ventvisor 94072

    SKU: VEN94072
    Product information
    • Weight2.9 lbs
    • Dimensions46.88 × 11.88 × 2 in
    • Product Line

      Original Ventvisor

    • Application Specific

      Yes

    • In Channel / Out Of Channel

      Out of Channel

    • Front Included

      Yes

    • Material

      Plastic

    Details...
    Original price was: $77.00.Current price is: $69.99.Add to cart
    Original price was: $77.00.Current price is: $69.99.
    Quantity Only 1 left in stock!
    -+
    Add to cart
    Add to wishlist
  • Add to wishlist
    Sale
    Wheel Front Aftermarket Shop
    Add to wishlist

    HUSKY LINERS Front Floor Liners 13251

    SKU: HSK13251
    Product information
    • Weight7.2 lbs
    • Dimensions32 × 28 × 5.5 in
    • Material

      Plastic

    • Color

      Black

    • Finish

      Natural

    • Quantity

      Pair

    • Product Line

      WeatherBeater

    Details...
    Original price was: $85.00.Current price is: $76.49.Add to cart
    Original price was: $85.00.Current price is: $76.49.
    Quantity Only 4 left in stock!
    -+
    Add to cart
    Add to wishlist
  • Add to wishlist
    Sale
    Wheel Front Aftermarket Shop
    Add to wishlist

    WHITELINE PERFORMANCE Spring Insulator Bushing Universal W73479

    SKU: WHIW73479
    Product information
    • Weight0.465 lbs
    • Dimensions7.95 × 6.1 × 2 in
    • Front / Rear

      Front, Rear

    • Inside Diameter

      2.75 in

    • Outside Diameter

      4.625 in

    • Material

      Polyurethane

    • Color

      Black

    Details...
    Original price was: $23.86.Current price is: $19.88.Add to cart
    Original price was: $23.86.Current price is: $19.88.Add to wishlist

    33