See more parts for American Motors AMX
Select the year of your American Motors AMX:
Product thumb
USA Standard Gear Manual Transmission T10 Synchro Ring Blocker ZMSRT10W-14A
$15.89

If you're diving into a restoration project or just need to keep your classic ride shifting smoothly, the T10 M/T Synchro Ring Blocker from USA Standard Gear is a solid choice. These parts are built tough, specifically designed for the T10 and T85 manual transmissions, so you know you're getting something reliable.

Why This Matters

These synchro ring blockers are essential for smooth gear transitions. They help prevent grinding and make sure your shifts are crisp, whether you're cruising down the highway or tearing up the track. If you’ve ever struggled with a stubborn transmission, you’ll appreciate the difference a good blocker can make.

What You Get

  • Fits T10/T85 manual transmissions—these are the real deal for your classic American muscle.
  • Includes blockers for 1st-2nd and 3rd-4th gears (T10), plus 2nd-3rd for T85, so you can tackle any shifting issue.
  • No worries about California Proposition 65—this part is compliant and ready for the road.

Heads-Up

Keep in mind, you might need more than one of these blockers depending on your specific setup. Check the table below to ensure you’re ordering enough for your project.

Compatibility

This blocker isn’t just for any vehicle; it fits a range of classic rides, including:

  • American Motors models like the Javelin (1968-1974) and Gremlin (1972-1974)
  • Buick Skylark and Special (1966)
  • Chevrolet classics like the Impala (1966) and Camaro (1974)
  • Ford Mustang (1966) and Galaxie (1966)
  • Pontiac Firebird (1974-1975)

So, if you're looking to keep your classic car’s transmission in top shape, this T10 M/T Synchro Ring Blocker is a must-have. It’s built to last and will keep your shifting smooth for years to come.

Proposition 65

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

Vehicle Make/Model
American Motors AMX 1968-1970 Base
American Motors Ambassador 1966-1967 990
American Motors Ambassador 1966-1967 880
American Motors Ambassador 1966-1970 DPL
American Motors Ambassador 1968-1970 Base
American Motors Ambassador 1968-1970 SST
American Motors American 1967-1968 Rogue
American Motors American 1967-1968 440
American Motors American 1967-1968 220
American Motors Classic 1966 770
American Motors Classic 1966 550
American Motors Gremlin 1972-1974 Base
American Motors Hornet 1970-1971, 1973-1974 Base
American Motors Hornet 1970-1971 SST
American Motors Hornet 1971 SC/360
American Motors Hornet 1971, 1973-1974 Sportabout
American Motors Javelin 1968-1972 SST
American Motors Javelin 1968-1974 Base
American Motors Javelin 1970 SST Trans Am
American Motors Javelin 1970 SST Mark Donohue
American Motors Javelin 1971-1974 AMX
American Motors Marlin 1966-1967 Base
American Motors Matador 1971-1974 Base
American Motors Matador 1974 Brougham
American Motors Matador 1974 X
American Motors Rambler 1969 Hurst SC/Rambler
American Motors Rambler 1969 Rogue
American Motors Rambler 1969 440
American Motors Rambler 1969 Base
American Motors Rebel 1966, 1970 Base
American Motors Rebel 1967-1968, 1970 SST
American Motors Rebel 1967-1968 550
American Motors Rebel 1967-1968 770
American Motors Rebel 1970 The Machine
Bricklin SV-1 1974 Base
Buick Electra 1966 Custom
Buick Electra 1966 Base
Buick Gran Sport 1966 Base
Buick Skylark 1966 Base
Buick Special 1966 Deluxe
Buick Special 1966 Base
Buick Sportwagon 1966 Custom
Buick Sportwagon 1966 Base
Buick Wildcat 1966 Base
Buick Wildcat 1966 Gran Sport
Buick Wildcat 1966 Custom
Checker Aerobus 1966 Base
Chevrolet Biscayne 1966 Base
Chevrolet Camaro 1974 Base
Chevrolet Camaro 1974 Z28
Chevrolet Camaro 1974 LT
Chevrolet Chevy II 1966 Base
Chevrolet Chevy II 1966 Nova SS
Chevrolet Chevy II 1966 Nova
Chevrolet Corvette 1974, 1984-1988 Base
Chevrolet Corvette 1986 Indianapolis 500 Pace Car
Chevrolet Corvette 1988 35th Anniversary Edition
Chevrolet G20 Van 1968-1970 Sportvan
Chevrolet G20 Van 1968-1970 Base
Chevrolet Impala 1966 SS
Chevrolet Impala 1966 Base
Ford Custom 1966 Base
Ford Galaxie 1966 Base
Ford Galaxie 500 1966 Base
Ford Galaxie 500 1966 XL
Ford LTD 1966 Base
Ford Mustang 1966 Shelby GT-350H
Ford Mustang 1966 Shelby GT-350
Ford Mustang 1966 Base
Ford P-350 1968-1971 Base
Iso Rivolta 1966-1969 Base
Pontiac Firebird 1974-1975 Trans Am
Pontiac Firebird 1974-1975 Esprit
Pontiac Firebird 1974-1975 Base
Pontiac Firebird 1974-1975 Formula
Pontiac Grand Am 1974 Base

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.

Check out these other great products