If you're looking to enhance your vehicle's performance, the USA Standard Gear ZG F8.8-390 Ring and Pinion Set is a solid choice. Designed for those who demand reliability and durability, this gear set delivers a 3.90 ratio, making it ideal for both daily driving and off-road adventures.
This ring and pinion set is engineered to provide a smooth and efficient drive, whether you're cruising the highways or tackling rough terrains. Customers have reported noticeable improvements in power delivery and overall handling after installation. One user shared, "After swapping out my old gears for the ZG F8.8-390, my truck feels so much more responsive. I couldn't be happier!"
This gear set comes with a 1-year warranty against manufacturer defects, ensuring peace of mind with your purchase. Its design is optimized for easy installation, making it a great choice for both seasoned mechanics and DIY enthusiasts.
Many customers appreciate the quality and performance of USA Standard Gear products. One satisfied buyer mentioned, "I installed this gear set in my Ford Explorer, and the difference was night and day. It's like a whole new vehicle!"
Upgrade your ride with the USA Standard Gear ZG F8.8-390 Ring and Pinion Set and experience the difference in performance and reliability.
⚠ WARNING:
Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov
| Vehicle Make/Model | Year | Trims |
|---|---|---|
| Ford Bronco | 1983, 1993 | XLT Lariat |
| Ford Bronco | 1983-1993 | Custom |
| Ford Bronco | 1983 | XLS |
| Ford Bronco | 1984-1992, 1994-1996 | XLT |
| Ford Bronco | 1985-1996 | Eddie Bauer |
| Ford Bronco | 1990-1996 | XL |
| Ford Bronco | 1992 | XLT Nite |
| Ford Bronco | 1995-1996 | XLT Sport |
| Ford Bronco II | 1984-1985 | XLS |
| Ford Bronco II | 1984-1990 | XLT |
| Ford Bronco II | 1984-1986 | Base |
| Ford Bronco II | 1984-1990 | Eddie Bauer |
| Ford Bronco II | 1987-1990 | XL |
| Ford Bronco II | 1988-1990 | XL Sport |
| Ford Bronco II | 1989-1990 | XLT Plus |
| Ford Crown Victoria | 1992 | Touring Sedan |
| Ford Crown Victoria | 1992-2005 | S |
| Ford Crown Victoria | 1992-2011 | LX |
| Ford Crown Victoria | 1992-2008, 2010-2011 | Base |
| Ford Crown Victoria | 1993-2011 | Police Interceptor |
| Ford Crown Victoria | 2002-2009 | LWB |
| Ford Crown Victoria | 2004-2006 | LX Sport |
| Ford Crown Victoria | 2005 | Special Edition |
| Ford Crown Victoria | 2006-2009 | Fleet |
| Ford E-100 Econoline | 1983 | XL |
| Ford E-100 Econoline | 1983 | Custom |
| Ford E-150 | 2002-2014 | XL |
| Ford E-150 | 2003-2014 | Base |
| Ford E-150 | 2006-2014 | XLT |
| Ford E-150 | 2006-2007 | Chateau |
| Ford E-150 Club Wagon | 2003-2005 | Chateau |
| Ford E-150 Club Wagon | 2003-2005 | XLT |
| Ford E-150 Club Wagon | 2003-2005 | XL |
| Ford E-150 Econoline | 1983-2000 | XL |
| Ford E-150 Econoline | 1983, 1987-1991 | Custom |
| Ford E-150 Econoline | 1984-1986, 1992-2002, 2007-2008 | Base |
| Ford E-150 Econoline Club Wagon | 1983, 1987-2000 | Custom |
| Ford E-150 Econoline Club Wagon | 1983-1991, 2001-2002 | XL |
| Ford E-150 Econoline Club Wagon | 1984-2002 | XLT |
| Ford E-150 Econoline Club Wagon | 1984-1986 | Base |
| Ford E-150 Econoline Club Wagon | 1992-2002 | Chateau |
| Ford E-250 Econoline | 1983, 1987-1991 | Custom |
| Ford E-250 Econoline | 1983-1998 | XL |
| Ford E-250 Econoline | 1984-1986, 1992-1998 | Base |
| Ford E-250 Econoline Club Wagon | 1983-1991 | XL |
| Ford E-250 Econoline Club Wagon | 1983, 1987-1991 | Custom |
| Ford E-250 Econoline Club Wagon | 1984-1991 | XLT |
| Ford E-250 Econoline Club Wagon | 1984-1986 | Base |
| Ford Expedition | 1997 | XLT Plus |
| Ford Expedition | 1997-2014 | XLT |
| Ford Expedition | 1997-2010 | Eddie Bauer |
| Ford Expedition | 2004 | NBX |
| Ford Expedition | 2004, 2006 | XLT Sport |
| Ford Expedition | 2004-2006 | XLS |
| Ford Expedition | 2005-2006, 2008-2014 | King Ranch |
| Ford Expedition | 2005-2014 | Limited |
| Ford Expedition | 2007-2014 | Max Limited |
| Ford Expedition | 2007-2014 | EL Limited |
| Ford Expedition | 2007-2014 | EL XLT |
| Ford Expedition | 2007-2008 | Eddie Bauer Max |
| Ford Expedition | 2007-2010 | Max Eddie Bauer |
| Ford Expedition | 2007-2010 | EL Eddie Bauer |
| Ford Expedition | 2008 | Funkmaster Flex Edition |
| Ford Expedition | 2008-2014 | EL King Ranch |
| Ford Expedition | 2009-2011 | Max King Ranch |
| Ford Expedition | 2011-2014 | XL |
| Ford Expedition | 2011, 2014 | Max XL |
| Ford Expedition | 2011-2014 | EL XL |
| Ford Explorer | 1991-1993 | 4x4 |
| Ford Explorer | 1991-1993 | Base |
| Ford Explorer | 1991-2010 | XLT |
| Ford Explorer | 1991-2000 | Sport |
| Ford Explorer | 1991-2010 | Eddie Bauer |
| Ford Explorer | 1991-1999 | XL |
| Ford Explorer | 1993-2010 | Limited |
| Ford Explorer | 1995 | Expedition |
| Ford Explorer | 1999-2006 | XLS |
| Ford Explorer | 2000-2003 | Postal |
| Ford Explorer | 2000-2001 | XL Fleet |
| Ford Explorer | 2004-2005 | XLS Sport |
| Ford Explorer | 2004-2005 | XLT Sport |
| Ford Explorer | 2004 | NBX |
| Ford Explorer | 2010 | XLT Base |
| Ford Explorer Sport | 2001-2003 | Base |
| Ford Explorer Sport | 2003 | XLS |
| Ford Explorer Sport | 2003 | XLT |
| Ford Explorer Sport Trac | 2001, 2007-2010 | Base |
| Ford Explorer Sport Trac | 2002 | XL |
| Ford Explorer Sport Trac | 2003-2005 | XLS |
| Ford Explorer Sport Trac | 2003-2005, 2007-2010 | XLT |
| Ford Explorer Sport Trac | 2005 | Adrenalin |
| Ford Explorer Sport Trac | 2007-2010 | Limited |
| Ford F-100 Ranger | 1996-1998 | Base |
| Ford F-100 Ranger | 1996-2001 | XL |
| Ford F-100 Ranger | 1996-2001 | XLT |
| Ford F-100 Ranger | 1999-2000 | HD |
| Ford F-100 Ranger | 1999-2000 | XLT Sport |
| Ford F-100 Ranger | 1999-2000 | XL Sport |
| Ford F-100 Ranger | 2001 | Sport |
| Ford F-150 | 1983-2014 | XL |
| Ford F-150 | 1983 | XLS |
| Ford F-150 | 1983-1986, 1997-2000 | Base |
| Ford F-150 | 1983-1992 | Custom |
| Ford F-150 | 1983-1984, 1990-2014 | XLT |
| Ford F-150 | 1984-1989 | Ranger |
| Ford F-150 | 1985-1992 | XLT Lariat |
| Ford F-150 | 1993-1995, 1999-2003 | Lightning |
| Ford F-150 | 1995-1996 | Eddie Bauer |
| Ford F-150 | 1995-1996 | Special |
| Ford F-150 | 1997-2014 | Lariat |
| Ford F-150 | 1998-1999 | Austera |
| Ford F-150 | 2000-2003, 2006-2008, 2010-2012 | Harley-Davidson Edition |
| Ford F-150 | 2001-2003, 2005-2014 | King Ranch |
| Ford F-150 | 2004-2014 | STX |
| Ford F-150 | 2004-2009 | Flotillera |
| Ford F-150 | 2004-2014 | FX4 |
| Ford F-150 | 2007-2008, 2010-2014 | FX2 |
| Ford F-150 | 2008 | THE 60TH ANNIVERSARY EDITION |
| Ford F-150 | 2008, 2013-2014 | Limited |
| Ford F-150 | 2008 | XTR |
| Ford F-150 | 2009-2014 | Platinum |
| Ford F-150 | 2010-2014 | SVT Raptor |
| Ford F-150 | 2011 | Lariat Limited |
| Ford F-150 | 2014 | Tremor |
| Ford F-150 Heritage | 2004 | XL |
| Ford F-150 Heritage | 2004 | SVT Lightning |
| Ford F-150 Heritage | 2004 | XLT |
| Ford Fairmont | 1978-1983 | Base |
| Ford Fairmont | 1978-1983 | Futura |
| Ford Fairmont | 1979-1983 | Wagon |
| Ford Fairmont | 1979-1983 | Elite |
| Ford Fairmont | 1981, 1983 | S |
| Ford Granada | 1979-1980 | ESS |
| Ford Granada | 1979-1980 | Base |
| Ford Granada | 1979-1980 | Ghia |
| Ford Granada | 1981-1982 | L |
| Ford Granada | 1981-1982 | GL |
| Ford Granada | 1981-1982 | GLX |
| Ford LTD | 1979-1986 | Country Squire |
| Ford LTD | 1979 | Landau |
| Ford LTD | 1979-1986 | Base |
| Ford LTD | 1980-1986 | Crown Victoria |
| Ford LTD | 1980-1982 | S |
| Ford LTD | 1983-1986 | Brougham |
| Ford LTD | 1985 | LX Brougham |
| Ford LTD | 1986 | Country Squire LX |
| Ford LTD | 1986 | Crown Victoria LX |
| Ford LTD Crown Victoria | 1987-1991 | LX |
| Ford LTD Crown Victoria | 1987-1991 | Base |
| Ford LTD Crown Victoria | 1987-1991 | S |
| Ford LTD II | 1979 | Landau |
| Ford LTD II | 1979 | S |
| Ford LTD II | 1979 | Base |
| Ford Mustang | 1979-1982 | Ghia |
| Ford Mustang | 1979-1984, 1994-2014 | Base |
| Ford Mustang | 1981, 1997 | Cobra |
| Ford Mustang | 1982-1984 | L |
| Ford Mustang | 1982-1983 | GL |
| Ford Mustang | 1982-2014 | GT |
| Ford Mustang | 1982-1983 | GLX |
| Ford Mustang | 1983 | Turbo GT |
| Ford Mustang | 1984 | GT-350 20th Anniversary |
| Ford Mustang | 1984-1993 | LX |
| Ford Mustang | 1984-1986 | SVO |
| Ford Mustang | 1993-1999, 2001, 2003-2004 | SVT Cobra |
| Ford Mustang | 1993, 1995, 2000 | SVT Cobra R |
| Ford Mustang | 1995 | GTS |
| Ford Mustang | 1996-1997 | High |
| Ford Mustang | 1998-2003 | Equipado |
| Ford Mustang | 1998 | Semi-Equipado |
| Ford Mustang | 2001 | GT Bullitt |
| Ford Mustang | 2003 | SVT Cobra 10th Anniversary |
| Ford Mustang | 2003-2004 | Mach 1 |
| Ford Mustang | 2007-2009 | Lujo |
| Ford Mustang | 2007-2008 | Shelby GT |
| Ford Mustang | 2007-2014 | Shelby GT500 |
| Ford Mustang | 2008-2009 | Shelby GT500KR |
| Ford Mustang | 2008-2009 | Bullitt |
| Ford Mustang | 2009-2014 | Shelby |
| Ford Mustang | 2012, 2014 | ST |
| Ford Mustang | 2012-2013 | Boss 302 |
| Ford Ranger | 1990-1992 | Custom |
| Ford Ranger | 1990-1992 | S |
| Ford Ranger | 1990-1997, 2005-2007 | STX |
| Ford Ranger | 1990-2011 | XLT |
| Ford Ranger | 1990 | S Plus |
| Ford Ranger | 1991-1993, 1997, 2002, 2006-2011 | Sport |
| Ford Ranger | 1993-1998 | Splash |
| Ford Ranger | 1993-2011 | XL |
| Ford Ranger | 1995 | XL Sport |
| Ford Ranger | 1998-2002 | EV |
| Ford Ranger | 2001-2005 | Edge |
| Ford Ranger | 2002 | Postal |
| Ford Ranger | 2004 | Tremor |
| Ford Ranger | 2005-2009 | FX4 |
| Ford Ranger | 2006-2010 | Limited |
| Ford Ranger | 2008-2011 | Base |
| Ford Thunderbird | 1987-1992, 1995-1996 | Base |
| Ford Thunderbird | 1987-1997 | LX |
| Ford Thunderbird | 1987-1988 | Sport |
| Ford Thunderbird | 1987-1988 | Turbo |
| Ford Thunderbird | 1987-1990 | Equipado |
| Ford Thunderbird | 1989-1995 | Super Coupe |
| Ford Thunderbird | 1991-1994 | V8 |
| Lincoln Aviator | 2003-2005 | Base |
| Lincoln Aviator | 2004-2005 | Luxury |
| Lincoln Aviator | 2004 | Ultimate |
| Lincoln Aviator | 2005 | Premier |
| Lincoln Continental | 1979-1980, 1982-1987 | Base |
| Lincoln Continental | 1982-1987 | Givenchy |
| Lincoln Continental | 1982 | Signature |
| Lincoln Continental | 1983-1985 | Valentino |
| Lincoln Mark LT | 2006-2008 | Base |
| Lincoln Mark VI | 1980-1983 | Base |
| Lincoln Mark VI | 1982-1983 | Signature |
| Lincoln Mark VI | 1982-1983 | Bill Blass |
| Lincoln Mark VI | 1982-1983 | Pucci |
| Lincoln Mark VI | 1982 | Givenchy |
| Lincoln Mark VII | 1984-1985 | Versace |
| Lincoln Mark VII | 1984-1992 | Bill Blass |
| Lincoln Mark VII | 1984-1987 | Base |
| Lincoln Mark VII | 1984-1992 | LSC |
| Lincoln Mark VIII | 1993-1998 | Base |
| Lincoln Mark VIII | 1995-1998 | LSC |
| Lincoln Mark VIII | 1996 | Anniversary |
| Lincoln Navigator | 1998-2005 | Base |
| Lincoln Navigator | 2004-2005 | Ultimate |
| Lincoln Town Car | 1981-1999 | Base |
| Lincoln Town Car | 1982-2003 | Cartier |
| Lincoln Town Car | 1982-2007 | Signature |
| Lincoln Town Car | 1989 | Signature SE |
| Lincoln Town Car | 1990-2011 | Executive |
| Lincoln Town Car | 1990-1995 | Cypress |
| Lincoln Town Car | 1990-1995, 1997 | Touring Edition |
| Lincoln Town Car | 1993 | Jack Nicklaus |
| Lincoln Town Car | 1994 | Tournament Edition |
| Lincoln Town Car | 1996 | Anniversary |
| Lincoln Town Car | 2001-2003 | Cartier L |
| Lincoln Town Car | 2001-2011 | Executive L |
| Lincoln Town Car | 2003 | Executive Protection Series |
| Lincoln Town Car | 2004 | Ultimate |
| Lincoln Town Car | 2004 | Ultimate L |
| Lincoln Town Car | 2004-2006 | Protection Series |
| Lincoln Town Car | 2005-2011 | Signature Limited |
| Lincoln Town Car | 2005-2011 | Signature L |
| Lincoln Town Car | 2006-2007 | Designer Series |
| Lincoln Town Car | 2007 | Designer |
| Mazda B3000 | 1994-1997, 2002, 2005-2007 | Base |
| Mazda B3000 | 1994-1996, 1998-2001, 2003-2004 | SE |
| Mazda B3000 | 1998, 2000 | SX |
| Mazda B3000 | 1999-2000 | Troy Lee |
| Mazda B3000 | 2001-2008 | DS |
| Mazda B4000 | 1994-1996 | LE |
| Mazda B4000 | 1994-2001, 2003-2007 | SE |
| Mazda B4000 | 1997, 2002-2007 | Base |
| Mazda B4000 | 2000 | Troy Lee |
| Mazda B4000 | 2001-2004 | DS |
| Mazda Navajo | 1991-1994 | LX |
| Mazda Navajo | 1992-1994 | DX |
| Mercury Capri | 1979-1983 | Base |
| Mercury Capri | 1979-1980 | Ghia |
| Mercury Capri | 1981-1986 | GS |
| Mercury Capri | 1982-1983 | L |
| Mercury Capri | 1982-1983 | Black Magic |
| Mercury Capri | 1982-1985 | RS |
| Mercury Capri | 1983 | Crimson Cat |
| Mercury Capri | 1984 | RS Turbo |
| Mercury Capri | 1986 | 5 |
| Mercury Cougar | 1979, 1981-1986 | Base |
| Mercury Cougar | 1979-1982, 1984-1997 | XR-7 |
| Mercury Cougar | 1982-1992 | LS |
| Mercury Cougar | 1982 | GS |
| Mercury Grand Marquis | 1975-1989 | Base |
| Mercury Grand Marquis | 1979-1986 | Colony Park |
| Mercury Grand Marquis | 1983-2011 | LS |
| Mercury Grand Marquis | 1987-2008 | GS |
| Mercury Grand Marquis | 2003 | LSE |
| Mercury Grand Marquis | 2005 | Ultimate Edition |
| Mercury Grand Marquis | 2005 | Limited Edition |
| Mercury Grand Marquis | 2005 | GSL |
| Mercury Marauder | 2003-2004 | Base |
| Mercury Mountaineer | 1997-2004, 2007-2010 | Base |
| Mercury Mountaineer | 2004-2010 | Premier |
| Mercury Mountaineer | 2005-2006 | Luxury |
| Mercury Mountaineer | 2005-2006 | Convenience |

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. |