If you're looking to enhance your vehicle's traction without breaking the bank, the SL GM12-30 Spartan Locker from USA Standard Gear is a fantastic choice. This locker is designed specifically for those who appreciate reliability and performance in their rides. Its innovative design eliminates the need for thrust washers and incorporates a unique spring and pin mechanism, making installation straightforward and hassle-free.
Customers have praised the SL GM12-30 for its ease of installation and significant performance improvements. One satisfied user noted, "I installed this locker in my '68 Camaro, and the difference is night and day. The traction is phenomenal, especially when cornering!" Another customer shared, "The quality of the materials is evident. I feel more confident off-roading with this locker in my truck."
This Spartan Locker is backed by a 1-year warranty against manufacturer defects, giving you peace of mind with your purchase. It's designed to withstand the rigors of both street and off-road driving, making it a versatile addition to your vehicle.
While specific fitment details are not provided for the SL GM12-30, it is designed for a wide range of GM vehicles. Please consult your vehicle's specifications to ensure compatibility.
Upgrade your ride with the USA Standard Gear SL GM12-30 Spartan Locker and experience the difference in traction and performance!
⚠ WARNING:
Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov
| Vehicle Make/Model | Year | Trims |
|---|---|---|
| Buick Wildcat | 1964-1969 | Base |
| Buick Wildcat | 1965-1970 | Custom |
| Buick Wildcat | 1965 | Deluxe |
| Buick Wildcat | 1966 | Gran Sport |
| Chevrolet Bel Air | 1964-1972 | Base |
| Chevrolet Biscayne | 1964-1972 | Base |
| Chevrolet Blazer | 1969-1974 | Base |
| Chevrolet Blazer | 1987 | Silverado |
| Chevrolet Blazer | 1987 | Custom Deluxe |
| Chevrolet C10 | 1975-1986 | Custom |
| Chevrolet C10 | 1975-1980 | Custom Deluxe |
| Chevrolet C10 | 1975-1986 | Scottsdale |
| Chevrolet C10 | 1975-1981 | Cheyenne |
| Chevrolet C10 | 1975-1986 | Silverado |
| Chevrolet C10 | 1978-1980 | Big Ten |
| Chevrolet C10 | 1981 | Deluxe |
| Chevrolet C10 Panel | 1963-1967 | Base |
| Chevrolet C10 Pickup | 1963-1974 | Base |
| Chevrolet C10 Suburban | 1967-1969, 1971-1974 | Base |
| Chevrolet C10 Suburban | 1975-1980, 1982, 1984-1986 | Scottsdale |
| Chevrolet C10 Suburban | 1975-1980 | Custom Deluxe |
| Chevrolet C10 Suburban | 1975-1980, 1982-1986 | Silverado |
| Chevrolet C10 Suburban | 1981 | Deluxe |
| Chevrolet C10 Suburban | 1981-1986 | Custom |
| Chevrolet C20 Suburban | 1967-1969, 1971-1974 | Base |
| Chevrolet C20 Suburban | 1975-1980, 1982, 1984-1986 | Scottsdale |
| Chevrolet C20 Suburban | 1975-1980 | Custom Deluxe |
| Chevrolet C20 Suburban | 1975-1977, 1979-1980, 1982-1986 | Silverado |
| Chevrolet C20 Suburban | 1981-1986 | Custom |
| Chevrolet C20 Suburban | 1981 | Deluxe |
| Chevrolet Camaro | 1967-1972 | RS |
| Chevrolet Camaro | 1967-1972 | Z28 |
| Chevrolet Camaro | 1967-1972 | Base |
| Chevrolet Camaro | 1967-1972 | SS |
| Chevrolet Caprice | 1966-1970 | Base |
| Chevrolet Chevelle | 1964-1968 | 300 |
| Chevrolet Chevelle | 1964-1965 | Malibu Super Sport |
| Chevrolet Chevelle | 1965-1972 | Malibu |
| Chevrolet Chevelle | 1965-1969 | 300 Deluxe |
| Chevrolet Chevelle | 1966 | Super Sport 396 |
| Chevrolet Chevelle | 1967-1970 | SS 396 |
| Chevrolet Chevelle | 1967-1972 | Concours |
| Chevrolet Chevelle | 1968-1972 | Nomad |
| Chevrolet Chevelle | 1968 | Nomad Custom |
| Chevrolet Chevelle | 1969-1972 | Greenbrier |
| Chevrolet Chevelle | 1969-1972 | Concours Estate |
| Chevrolet Chevelle | 1970-1972 | Base |
| Chevrolet Chevelle | 1971-1972 | SS |
| Chevrolet Chevy II | 1964-1967 | Nova SS |
| Chevrolet Chevy II | 1964-1968 | Nova |
| Chevrolet Chevy II | 1964-1967 | Base |
| Chevrolet El Camino | 1965-1972 | Base |
| Chevrolet El Camino | 1968-1972 | SS |
| Chevrolet El Camino | 1968-1972 | Custom |
| Chevrolet G10 | 1975-1981 | Beauville |
| Chevrolet G10 | 1975-1981 | Chevy Van |
| Chevrolet G10 | 1975-1981 | Sportvan |
| Chevrolet G10 | 1981 | Bonaventure |
| Chevrolet G10 Van | 1967, 1969-1974 | Base |
| Chevrolet G10 Van | 1968-1974 | Sportvan |
| Chevrolet Impala | 1964-1972 | Base |
| Chevrolet Impala | 1964-1967 | SS |
| Chevrolet K10 | 1975-1980 | Custom Deluxe |
| Chevrolet K10 | 1975-1981 | Cheyenne |
| Chevrolet K10 | 1975-1986 | Scottsdale |
| Chevrolet K10 | 1975-1986 | Silverado |
| Chevrolet K10 | 1981-1986 | Custom |
| Chevrolet K10 | 1981 | Deluxe |
| Chevrolet K10 Pickup | 1963-1974 | Base |
| Chevrolet K10 Suburban | 1967-1974 | Base |
| Chevrolet K10 Suburban | 1975-1977, 1979-1980, 1982-1983, 1985-1986 | Silverado |
| Chevrolet K10 Suburban | 1975-1980, 1982, 1984-1986 | Scottsdale |
| Chevrolet K10 Suburban | 1975-1980 | Custom Deluxe |
| Chevrolet K10 Suburban | 1981-1986 | Custom |
| Chevrolet K10 Suburban | 1981 | Deluxe |
| Chevrolet K20 Suburban | 1967-1969, 1971-1974 | Base |
| Chevrolet K20 Suburban | 1975-1980 | Custom Deluxe |
| Chevrolet K20 Suburban | 1975-1980, 1982, 1984-1986 | Scottsdale |
| Chevrolet K20 Suburban | 1975-1977, 1979-1980, 1982-1983, 1985-1986 | Silverado |
| Chevrolet K20 Suburban | 1981-1986 | Custom |
| Chevrolet K20 Suburban | 1981 | Deluxe |
| Chevrolet K5 Blazer | 1975, 1977-1980 | Custom Deluxe |
| Chevrolet K5 Blazer | 1975-1980 | Cheyenne |
| Chevrolet K5 Blazer | 1976 | Base |
| Chevrolet K5 Blazer | 1978, 1980-1986 | Silverado |
| Chevrolet K5 Blazer | 1981 | Deluxe |
| Chevrolet K5 Blazer | 1981-1986 | Custom |
| Chevrolet K5 Blazer | 1984 | Scottsdale |
| Chevrolet Monte Carlo | 1970-1972 | Base |
| Chevrolet Nova | 1969-1972 | Base |
| Chevrolet R10 | 1987 | Scottsdale |
| Chevrolet R10 | 1987 | Custom Deluxe |
| Chevrolet R10 | 1987 | Silverado |
| Chevrolet R10 Suburban | 1987-1988 | Silverado |
| Chevrolet R10 Suburban | 1987-1988 | Scottsdale |
| Chevrolet R10 Suburban | 1987 | Custom Deluxe |
| Chevrolet R20 Suburban | 1987-1988 | Silverado |
| Chevrolet R20 Suburban | 1987-1988 | Scottsdale |
| Chevrolet R20 Suburban | 1987 | Custom Deluxe |
| Chevrolet S10 Blazer | 1987 | Base |
| Chevrolet S10 Blazer | 1987 | Sport |
| Chevrolet S10 Blazer | 1987 | High Country |
| Chevrolet S10 Blazer | 1987 | Tahoe |
| Chevrolet Suburban | 1963-1966, 1987-1988 | Base |
| Chevrolet V10 | 1987 | Scottsdale |
| Chevrolet V10 | 1987 | Custom Deluxe |
| Chevrolet V10 | 1987 | Silverado |
| Chevrolet V10 Suburban | 1987-1988 | Silverado |
| Chevrolet V10 Suburban | 1987 | Custom Deluxe |
| Chevrolet V10 Suburban | 1987-1988 | Scottsdale |
| Chevrolet V20 Suburban | 1987 | Custom Deluxe |
| Chevrolet V20 Suburban | 1987-1988 | Silverado |
| Chevrolet V20 Suburban | 1987-1988 | Scottsdale |
| GMC C15 | 1975-1978 | Sierra Grande |
| GMC C15 | 1975-1978 | High Sierra |
| GMC C15 | 1975-1978 | Sierra Classic |
| GMC C15 | 1975-1978 | Base |
| GMC C15 | 1977-1978 | Heavy Half |
| GMC C15 | 1977 | Indy Hauler |
| GMC C15 | 1978 | Street Coupe |
| GMC C15 Suburban | 1975-1978 | Sierra Grande |
| GMC C15 Suburban | 1975-1978 | Base |
| GMC C15 Suburban | 1975-1978 | High Sierra |
| GMC C15 Suburban | 1975-1978 | Sierra Classic |
| GMC C15/C1500 Pickup | 1967-1974 | Base |
| GMC C15/C1500 Suburban | 1967-1974 | Base |
| GMC C1500 | 1979-1986 | High Sierra |
| GMC C1500 | 1979-1982 | Street Coupe |
| GMC C1500 | 1979-1980 | Heavy Half |
| GMC C1500 | 1979-1986 | Base |
| GMC C1500 | 1979-1982 | Sierra Grande |
| GMC C1500 | 1979-1986 | Sierra Classic |
| GMC C1500 Suburban | 1979-1982 | Sierra Grande |
| GMC C1500 Suburban | 1979-1986 | Sierra Classic |
| GMC C1500 Suburban | 1979-1986 | High Sierra |
| GMC C1500 Suburban | 1979-1986 | Base |
| GMC G15 | 1975-1978 | Vandura |
| GMC G15 | 1975-1978 | Rally |
| GMC G15 | 1975-1978 | Rally STX |
| GMC G15/G1500 Van | 1967, 1970-1971 | Base |
| GMC G15/G1500 Van | 1968-1969, 1971-1974 | Rally |
| GMC G15/G1500 Van | 1968-1974 | Vandura |
| GMC G1500 | 1964-1966 | Base |
| GMC G1500 | 1979-1987 | Rally |
| GMC G1500 | 1979-1987 | Vandura |
| GMC G1500 | 1979-1987 | Rally STX |
| GMC G1500 | 1983-1984 | Rally Custom |
| GMC G25 | 1975-1978 | Vandura |
| GMC G25 | 1975-1978 | Rally STX |
| GMC G25 | 1975-1978 | Rally |
| GMC G25/G2500 Van | 1967, 1970-1972 | Base |
| GMC G25/G2500 Van | 1968-1969, 1971-1974 | Rally |
| GMC G25/G2500 Van | 1968-1974 | Vandura |
| GMC G2500 | 1979-1981 | Rally STX |
| GMC G2500 | 1979-1981 | Vandura |
| GMC G2500 | 1979-1981 | Rally |
| GMC K15 | 1975-1978 | Sierra Grande |
| GMC K15 | 1975-1978 | Base |
| GMC K15 | 1975-1978 | Sierra Classic |
| GMC K15 | 1975-1978 | High Sierra |
| GMC K15 | 1977 | Indy Hauler |
| GMC K15 Suburban | 1975-1978 | Base |
| GMC K15 Suburban | 1975-1978 | Sierra Grande |
| GMC K15 Suburban | 1975-1978 | High Sierra |
| GMC K15 Suburban | 1975-1978 | Sierra Classic |
| GMC K15/K1500 Pickup | 1966-1974 | Base |
| GMC K15/K1500 Suburban | 1967-1974 | Base |
| GMC K1500 | 1979-1986 | Sierra Classic |
| GMC K1500 | 1979-1982 | Sierra Grande |
| GMC K1500 | 1979-1986 | High Sierra |
| GMC K1500 | 1979-1986 | Base |
| GMC K1500 Suburban | 1979-1986 | High Sierra |
| GMC K1500 Suburban | 1979-1986 | Sierra Classic |
| GMC K1500 Suburban | 1979-1986 | Base |
| GMC K1500 Suburban | 1979-1982 | Sierra Grande |
| GMC K25/K2500 Suburban | 1967 | Base |
| GMC R1500 | 1987 | High Sierra |
| GMC R1500 | 1987 | Base |
| GMC R1500 | 1987 | Sierra Classic |
| GMC R1500 Suburban | 1987 | High Sierra |
| GMC R1500 Suburban | 1987 | Base |
| GMC R1500 Suburban | 1987 | Sierra Classic |
| GMC Suburban | 1963-1966 | Base |
| GMC V1500 | 1987 | High Sierra |
| GMC V1500 | 1987 | Base |
| GMC V1500 | 1987 | Sierra Classic |
| GMC V1500 Suburban | 1987 | High Sierra |
| GMC V1500 Suburban | 1987 | Sierra Classic |
| GMC V1500 Suburban | 1987 | Base |
| Pontiac Firebird | 1969 | 400 |
| Pontiac Firebird | 1969 | 350 |
| Pontiac Firebird | 1969-1972 | Trans Am |
| Pontiac Firebird | 1969 | Sprint |
| Pontiac Firebird | 1969 | 350 HO |
| Pontiac Firebird | 1969-1972 | Base |
| Pontiac Firebird | 1970-1972 | Formula |
| Pontiac Firebird | 1970-1972 | Esprit |
| Pontiac GTO | 1970-1972 | Base |
| Pontiac GTO | 1970-1971 | The Judge |

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. |