If you're looking to maintain or enhance the performance of your manual transmission, the ZMM5R1-2.5A Synchro Assembly from USA Standard Gear is your go-to solution. This high-quality assembly is designed specifically for a range of vehicles, including:
This synchro assembly is crafted to meet the high standards of performance and durability that you expect from USA Standard Gear. Whether you're replacing worn-out components or upgrading for better shifting performance, this assembly ensures smooth gear transitions and enhances overall driving experience.
Ford Ranger owners have shared their experiences, with one stating: “I installed the ZMM5R1-2.5A in my 2005 Ranger, and the difference was night and day. The shifts are now crisp and precise, making my daily drive much more enjoyable.”
Another customer with a 1991 Explorer noted: “After replacing the synchro assembly, I noticed a significant improvement in my gear engagement. It feels like a new transmission!”
When installing the ZMM5R1-2.5A, ensure that you have the necessary tools and follow the manufacturer's guidelines for best results. This assembly is designed to fit seamlessly into your vehicle's existing setup, making it a straightforward replacement for DIY enthusiasts.
⚠ WARNING:
Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov
| Make Vehicle | Model | Year |
|---|---|---|
|
1988-1990 Ford Bronco |
Bronco | 1988-1990 |
|
1991-2003 Ford Explorer |
Explorer | 1991-2003 |
|
1988-2011 Ford Ranger |
Ranger | 1988-2011 |
|
1994-1997, 2002 Mazda B-Series |
B-Series | 1994-1997, 2002 |
|
1994-1997, 2001, 2003-2009 Mazda B2300 |
B2300 | 1994-1997, 2001, 2003-2009 |
|
1998-2001 Mazda B2500 |
B2500 | 1998-2001 |
|
1998-2001, 2003-2007 Mazda B3000 |
B3000 | 1998-2001, 2003-2007 |
|
1998-2001, 2003-2009 Mazda B4000 |
B4000 | 1998-2001, 2003-2009 |
|
1991-1994 Mazda Navajo |
Navajo | 1991-1994 |

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 ExpertsThe 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 ProductAll 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 RacingIf 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.
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 |
|---|---|---|
| Spool | As 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 Set | One (1) Year | Warrantied against manufacturing defects for one (1) year. |
| Positraction Differential | One (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 Locker | One (1) Year | Warrantied against manufacturers defects for one (1) year. |
| Install Kits | One (1) Year | Includes ZBK, ZPK, and ZK. Covers parts for one year against manufacturing defects. |
| Spider Gear Kits (ZIK) | One (1) Year | One 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. |