If you're looking to keep your classic GM vehicle running smoothly, the USA Standard Gear ZMBK131A M/T Bearing Kit is an essential component for your transmission overhaul. Designed specifically for models from 1955 to 1968, this kit is a reliable choice for those who appreciate the craftsmanship of their vintage rides.
This M/T Bearing Kit is tailored for the Muncie 318 non-overdrive transmission, featuring a 4 bolt side cover and a main case that measures 7-1/8 inches long. It’s synchronized in both 2nd and 3rd gears, ensuring smooth shifting and reliable performance. Please note that this kit does not include synchronizer rings, so be sure to have those on hand if needed for your restoration project.
This bearing kit is compatible with several classic vehicles, including:
Classic car owners have found this kit invaluable for their rebuilds. For instance, a Chevrolet Impala owner shared, “I installed the ZMBK131A in my 1965 Impala, and it shifted like new again. Perfect fit, and I didn’t have to worry about any missing parts!”
Whether you're restoring a vintage ride or simply need to replace worn-out components, the USA Standard Gear ZMBK131A M/T Bearing Kit delivers the quality and reliability you expect from a trusted name in automotive parts.
⚠ WARNING:
Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov
| Vehicle Make/Model | Year | Trims |
|---|---|---|
| Buick Century | 1955-1958 | Base |
| Buick Electra | 1959-1967 | Base |
| Buick Electra | 1959-1962 | 225 |
| Buick Electra | 1966-1967 | Custom |
| Buick Gran Sport | 1965-1967 | Base |
| Buick Invicta | 1959-1960 | Base |
| Buick LeSabre | 1959-1960, 1963-1968 | Base |
| Buick LeSabre | 1965-1968 | Custom |
| Buick Skylark | 1961-1968 | Base |
| Buick Skylark | 1968 | Custom |
| Buick Special | 1955-1958, 1961-1968 | Base |
| Buick Special | 1961-1967 | Deluxe |
| Buick Sportwagon | 1965-1968 | Base |
| Buick Sportwagon | 1966, 1968 | Custom |
| Buick Super | 1955-1958 | Base |
| Buick Wildcat | 1963-1968 | Base |
| Buick Wildcat | 1965-1968 | Custom |
| Buick Wildcat | 1965 | Deluxe |
| Buick Wildcat | 1966 | Gran Sport |
| Chevrolet Bel Air | 1955-1956 | Beauville |
| Chevrolet Bel Air | 1955-1968 | Base |
| Chevrolet Bel Air | 1955-1957 | Nomad |
| Chevrolet Biscayne | 1958-1968 | Base |
| Chevrolet Biscayne | 1960 | Fleetmaster |
| Chevrolet C10 Panel | 1967 | Base |
| Chevrolet C10 Pickup | 1967-1968 | Base |
| Chevrolet C10 Suburban | 1967-1968 | Base |
| Chevrolet C20 Suburban | 1967-1968 | Base |
| Chevrolet Camaro | 1967-1968 | RS |
| Chevrolet Camaro | 1967-1968 | Base |
| Chevrolet Camaro | 1967-1968 | Z28 |
| Chevrolet Camaro | 1967-1968 | SS |
| Chevrolet Caprice | 1966-1968 | Base |
| Chevrolet Chevelle | 1964-1965 | Malibu Super Sport |
| Chevrolet Chevelle | 1964-1968 | 300 |
| Chevrolet Chevelle | 1964-1966, 1968 | SS |
| Chevrolet Chevelle | 1965-1968 | 300 Deluxe |
| Chevrolet Chevelle | 1965-1968 | Malibu |
| Chevrolet Chevelle | 1966 | Super Sport 396 |
| Chevrolet Chevelle | 1967-1968 | Concours |
| Chevrolet Chevelle | 1967-1968 | SS 396 |
| Chevrolet Chevelle | 1968 | Base |
| Chevrolet Chevelle | 1968 | Nomad |
| Chevrolet Chevelle | 1968 | Nomad Custom |
| Chevrolet Chevy II | 1962-1967 | Nova |
| Chevrolet Chevy II | 1962-1967 | Base |
| Chevrolet Chevy II | 1964-1967 | Nova SS |
| Chevrolet Corvette | 1955-1968 | Base |
| Chevrolet Del Ray | 1958 | Base |
| Chevrolet El Camino | 1959-1960, 1964-1968 | Base |
| Chevrolet El Camino | 1968 | SS |
| Chevrolet El Camino | 1968 | Custom |
| Chevrolet G20 Van | 1967-1968 | Base |
| Chevrolet G20 Van | 1968 | Sportvan |
| Chevrolet Impala | 1958-1968 | Base |
| Chevrolet Impala | 1964-1967 | SS |
| Chevrolet K10 Pickup | 1967-1968 | Base |
| Chevrolet K10 Suburban | 1967-1968 | Base |
| Chevrolet K20 Suburban | 1967-1968 | Base |
| Chevrolet Nomad | 1958-1961 | Base |
| Chevrolet One-Fifty Series | 1955-1957 | Base |
| Chevrolet P10 Series | 1960-1967 | Base |
| Chevrolet Sedan Delivery | 1955-1960 | Base |
| Chevrolet Truck | 1955-1958 | 3700 |
| Chevrolet Truck | 1955-1958 | 3100 |
| Chevrolet Truck | 1955-1958 | 3600 |
| Chevrolet Truck | 1955-1958 | 3400 |
| Chevrolet Truck | 1955-1958 | Base |
| Chevrolet Truck | 1955-1958 | 3800 |
| Chevrolet Truck | 1955-1958 | 3200 |
| Chevrolet Truck | 1955-1958 | 3500 |
| Chevrolet Two-Ten Series | 1955-1957 | Del Ray |
| Chevrolet Two-Ten Series | 1955-1957 | Base |
| Chevrolet Yeoman | 1958 | Base |
| GMC 100 | 1955-1959 | Base |
| GMC 150 | 1955-1959 | Base |
| GMC 1500 | 1966 | Base |
| GMC 1500 Series | 1960-1965 | Base |
| GMC 250 | 1955-1959 | Base |
| GMC C15/C1500 Pickup | 1967-1968 | Base |
| GMC C15/C1500 Suburban | 1967-1968 | Base |
| GMC G1500 | 1964-1966 | Base |
| GMC I1000 | 1964-1966 | Base |
| GMC I1500 | 1965-1966 | Base |
| GMC I2500 | 1965-1966 | Base |
| Oldsmobile 442 | 1965-1968 | Base |
| Oldsmobile 88 | 1955-1957 | Base |
| Oldsmobile 88 | 1955-1957 | Holiday |
| Oldsmobile 98 | 1955-1960, 1965-1968 | Base |
| Oldsmobile 98 | 1958-1960, 1965-1967 | Holiday |
| Oldsmobile Cutlass | 1964-1965 | Holiday |
| Oldsmobile Cutlass | 1964-1965 | Base |
| Oldsmobile Delmont 88 | 1967-1968 | Base |
| Oldsmobile Delmont 88 | 1967 | Holiday |
| Oldsmobile Delta 88 | 1968 | Custom |
| Oldsmobile Delta 88 | 1968 | Base |
| Oldsmobile Dynamic 88 | 1958-1960, 1965-1966 | Base |
| Oldsmobile Dynamic 88 | 1958-1960, 1965-1966 | Holiday |
| Oldsmobile F85 | 1961-1968 | Base |
| Oldsmobile F85 | 1962-1966 | Deluxe |
| Oldsmobile F85 | 1966 | Holiday |
| Oldsmobile Jetfire | 1962-1963 | Base |
| Oldsmobile Jetstar 88 | 1964-1966 | Base |
| Oldsmobile Jetstar 88 | 1964-1966 | Holiday |
| Oldsmobile Jetstar I | 1964-1965 | Base |
| Oldsmobile Starfire | 1964-1966 | Base |
| Oldsmobile Super 88 | 1955-1960, 1964 | Base |
| Oldsmobile Super 88 | 1955-1960, 1964 | Holiday |
| Oldsmobile Vista Cruiser | 1964-1967 | Custom |
| Oldsmobile Vista Cruiser | 1964-1968 | Base |
| Pontiac Acadian | 1962-1967 | Base |
| Pontiac Bonneville | 1957-1968 | Base |
| Pontiac Bonneville | 1959-1968 | Safari |
| Pontiac Bonneville | 1959-1962 | Custom |
| Pontiac Catalina | 1959-1968 | Base |
| Pontiac Catalina | 1959-1968 | Safari |
| Pontiac Catalina | 1962-1968 | Ventura |
| Pontiac Catalina | 1964-1967 | 2+2 |
| Pontiac Chieftain | 1955-1958 | Base |
| Pontiac Chieftain | 1955, 1958 | Safari |
| Pontiac Chieftain | 1957 | Custom Safari Transcontinental |
| Pontiac Chieftain | 1957 | Custom Safari |
| Pontiac Executive | 1967-1968 | Safari |
| Pontiac Executive | 1967-1968 | Base |
| Pontiac Firebird | 1967-1968 | Sprint |
| Pontiac Firebird | 1967 | 326 |
| Pontiac Firebird | 1967-1968 | HO |
| Pontiac Firebird | 1967-1968 | Base |
| Pontiac Firebird | 1967-1968 | 400 |
| Pontiac Firebird | 1968 | 350 |
| Pontiac GTO | 1964-1966 | Base |
| Pontiac Grand Prix | 1962-1968 | Base |
| Pontiac LeMans | 1963-1968 | Base |
| Pontiac Star Chief | 1955-1966 | Base |
| Pontiac Star Chief | 1955-1957 | Custom |
| Pontiac Star Chief | 1958 | Custom Safari |
| Pontiac Star Chief | 1958 | Super Deluxe |
| Pontiac Star Chief | 1966 | Executive |
| Pontiac Super Chief | 1957-1958 | Base |
| Pontiac Tempest | 1961, 1964-1968 | Custom |
| Pontiac Tempest | 1961-1968 | Base |
| Pontiac Tempest | 1961-1962 | LeMans |
| Pontiac Tempest | 1961-1968 | Safari |

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. |