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  See more parts for American Motors AMX
Select the year of your American Motors AMX:
USA Standard Gear AMC 20 Gear Set Ring and Pinion 4.56 Ratio ZG M20-456 - ZG M20-456

If you’re diving into a project where precision matters, you’ll want to check out the USA Standard ring and pinion sets. These aren't just any gears; they’re built for real-world performance and reliability. I’ve had my fair share of experiences with different gear sets, and I can say that USA Standard really delivers, especially when you’re looking to boost your confidence during installation.

Now, let’s get into the nitty-gritty. This set is designed to fit the AMC Model 20, which means you’re in good hands if you’re working on classic rides like the 1968-1970 AMX or the 1971-1978 Matador. The ring gear diameter is a solid 8.875 inches, which gives you that sturdy feel you want when you’re out on the trails or just cruising around town. With a 28 spline pinion and eight ring gear bolts, you know it’s built to handle whatever you throw at it.

The 4.56 gear ratio is where things get really interesting. It’s perfect for those who want a bit more torque without sacrificing too much on the highway. Whether you’re tackling steep inclines or just need that extra push when you’re loaded up, this gear set has got your back.

And hey, if you’re worried about quality, USA Standard backs their products with a one-year warranty against manufacturer defects. That’s peace of mind right there, knowing you’re covered if something goes sideways.

So, whether you’re restoring a classic Jeep CJ7 from the ‘80s or working on a Hummer H1, this gear set fits a range of vehicles. Just to name a few, it’s compatible with:

  • American Motors AMX (1968-1970)
  • American Motors Concord (1978-1979)
  • Jeep CJ5 (1976-1983)
  • Jeep Wagoneer (1979-1986)
  • And many more!

In the end, if you want a gear set that feels like it was designed by someone who gets what it means to hit the road (or trail), the USA Standard ring and pinion set is definitely worth considering.

Proposition 65

⚠ WARNING: Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov

Vehicle
1968-1970
 American Motors AMX
1978-1979
 American Motors Concord
1970-1977
 American Motors Hornet
1968-1974
 American Motors Javelin
1971-1978
 American Motors Matador
1975-1980
 American Motors Pacer
2002-2004, 2006
 Hummer H1
1976-1983
 Jeep CJ5
1976-1986
 Jeep CJ7
1976-1986
 Jeep J10
1981-1986
 Jeep Scrambler
1979-1986
 Jeep Wagoneer

USA Standard Gear Banner

Who is USA Standard Gear?

USA Standard Gear is a company that supplies high-quality parts for the automotive industry. They are a one-stop-shop for all your drivetrain component needs and have one of the industry's most comprehensive parts list and inventory. Today, they are considered the leading supplier of these parts in the United States.

Drivetrain Experts

The company offers various parts ranging from axles, differential gears, lockers, limited slips, drivelines, and more. It is built by a team of craftsmen who has years of experience when it comes to assembling and modifying their own builds. This passion is what drives the company to create some of the best products in the market.

Quality In Every Product

All their parts are manufactured in their facility equipped with the latest and most sophisticated tools available today. They also have two high-tech testing labs to ensure that every product comes out with the company's quality.

The USA Standard Gear engineering team is constantly on edge trying to find ways to develop and further improve their products. That is why they can produce innovative parts that adapt to the changing trend in the automotive world.

Purchase USA Standard Gear at Vivid Racing

If you are in the market for reliable and top-notched drivetrain components, then USA Standard Gear is the brand for you. With years of experience developing their products, they have provided their customers with parts they could trust, whether it's a replacement component or an upgrade. 

To know more about USA Standard Gear, visit Vivid Racing and check out their list of offerings that fit your specific requirement.





USA Standard Gear® ("USA Standard") warrants the original retail purchaser that all USA Standard products will be free from defects in materials and workmanship for the periods shown herein. USA Standard makes no other warranty of any kind, express or implied. All other warranties, including but not limited to an implied warranty of merchantability or fitness for a particular purpose, are excluded. This warranty is offered provided that the USA Standard product has been installed and maintained in accordance with USA Standard instructions, and that it has not been subject to modification, accident, abnormal use or misuse. At USA Standard's discretion, this warranty may be voided if installation of USA Standard product(s) occurs on vehicles with tires that exceed USA Standard Maximum Recommended Tire Size.

Upon notification of a warranty claim, USA Standard shall investigate the claim of defect, and, in the event of a verified defect, shall, at their sole choice, either repair the defective product or replace it.

This warranty does not cover, and USA Standard shall not be liable for, incidental or consequential damages, including loss of time, road service charges, labor charges, inconvenience, loss of vehicle use, loss of revenues, or loss or damage to personal property (including loss or damage to vehicle parts due to the failure of the USA Standard product). In addition, this warranty does not cover, and USA Standard shall not be liable for, any undertaking, representation, or agreements made by dealers or other third parties selling USA Standard Gear® products, except where such agreements are within the provisions of this Warranty statement. Also, this warranty does not cover damage to the axle caused by or facilitated by failure of a non-USA Standard component.

This agreement offers you specific legal rights. You may also have other rights which vary from state to state.

USA STANDARD GEAR® WARRANTY BY PRODUCT
USA Standard Product Length of Warranty (From date of sale) NOTES
SpoolAs long as original purchaser owns vehicle in which Spool is originally installed It is normal for Spools to cause tire chatter, squeal, or scrubbing when vehicle is not moving in a straight line. Both rear tires must measure the same height from ground to top of wheel for Spool to function properly without premature wear.
Rear Axle (1040/1050)Five (5) Years Covers parts for five years against manufacturing defects.
Front Axle (Series ZA W)Five (5) Years Five year warranty covering manufacturing defects and axle breakage. This warranty is not transferable to another party. “No Questions Asked” replacement for first warranty return, however, USA Standard Gear reserves the right to either replace axle or refund original purchase price after the first warranty claim. USA Standard Gear (through RANDYS Worldwide Automotive) makes final determination on warranty considerations.
Ring & Pinion Gear SetOne (1) YearWarrantied against manufacturing defects for one (1) year.
Positraction DifferentialOne (1) Year Exclusions apply, does not cover premature clutch wear or abuse. It is normal for Positraction differentials to cause tire chatter, squeal, or scrubbing when vehicle is not moving in a straight line. Both rear tires must measure the same height from ground to top of wheel for differential to function properly without premature wear. Limited slip additive or appropriate friction modifier must be used with oil to reduce Positraction chatter.
Spartan LockerOne (1) YearWarrantied against manufacturers defects for one (1) year.
Install KitsOne (1) Year Includes ZBK, ZPK, and ZK. Covers parts for one year against manufacturing defects.
Spider Gear Kits (ZIK)One (1) YearOne year against manufacturing defects. Exclusions apply, does not cover clutch wear in limited slip differentials.
Replacement Driveshafts (ZDS)One (1) Year Warrantied against manufacturing defects for one (1) year.

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