Understanding Shift Knob Adapters for Your Hot Rod

Understanding Shift Knob Adapters for Your Hot Rod

You've spent countless hours perfecting your ride, from the roar of the engine to the gleam of the chrome. Every detail matters, and the shift knob is no exception. It's not just a functional piece; it's a critical touchpoint that connects you to your machine, reflecting your style and passion.

Unfortunately, there is no standard shift stick thread size, so most knob installations require a shift knob adapter.

Gennie Shifter's Thread Basics:

Gennie Shifter chose 16 mm – 1.5 threads for almost all of our knobs. (Check the product listing.) You just need to figure out the stick thread size.

·         If you are buying a Gennie Shifter Stick, that’s easy. Our Stainless Perfect Shift Stick have 5/16 – 18 threads, so you need the 16 mm – 1.5 to 5/16 – 18 adapter.

·         Our Tremec stick that are designed for manual transmissions have a  3/8 – 16 threads, so you need the 16 mm – 1.5 to 3/8 – 16 adapter.

·         Our Aluminum Commander Sticks have beefier 7/16 – 20 threads, so you need a 16 mm – 1.5 to 7/16 – 20 adapter.

 

Other Applications

If you have a manual transmission stick from your vehicle manufacturer, you may be able to find the thread in the list below this article.   

If you have the original knob,  you can take it into a hardware store like Lowes, Home Depot, or Ace. Most of these stores will have a nut and bolt testing station. If you don’t have the knob, then you may be able to take the stick or a nut that fits on the stick to one of these stores.

If you do quite a bit of adapting shift sticks to shift knobs, we recommend you buy a “nut and bolt thread size checker in metric and SAE.” We take one of these to shows to help people find the best fit fast.

We are here to help. You can use the chat option or call us at 303-623-1963.

 

Manual Shift Stick Thread Sizes by Make, Model, and Thread Size

We can't guarantee the accuracy of this list. Always confirm your thread size! 

Acura

  • CL: M10 x 1.5mm (1997-2003)
  • CSX: M10 x 1.5mm (2006-2011)
  • EL: M10 x 1.5mm (1997-2005)
  • ILX: M10 x 1.5mm (2013-2016)
  • Integra: M10 x 1.5mm (1985-2001, 1985-2006)
  • Legend: M10 x 1.5mm (1986-1996)
  • NSX: M10 x 1.5mm (1990-2005, 1991-2005)
  • RSX: M10 x 1.5mm (2001-2011)
  • TL: M10 x 1.5mm (1996-2014)
  • TSX: M10 x 1.5mm (2004-2014)
  • Most Models: M10 x 1.5mm

Alfa Romeo

  • Most Models: Non-threaded (requires adapter)

AMC

  • AMX: 3/8 - 24 (1969)
  • Javelin: 3/8 - 16 (1969)
  • Factory Hurst (flat stick): 3/8 - 16 (1971-1974)
  • Factory Hurst (1968-1970): 3/8 - 24
  • "Non-Hurst": 1/2 - 20 (1968-1970)

Audi

  • A4: M12 x 1.5mm (1996-2001)
  • Most Models: M12 x 1.5mm
  • Late Model: Non-threaded (requires specific adapter)

Austin Healey

  • 6 Cylinder: 3/8 - 16

BMW

  • Model 2002: 15mm x 1.50mm (1971)
  • Most Models (1982+): Non-threaded (requires specific adapter, e.g., ZHP knob fits all 1982+ manual BMWs)

Chevrolet / GM

  • Blazer:
    • Manual: 3/8 - 24 (1973)
    • Transfer Case: 7/16 - 20 (1973, 1979 K10 Truck), 7/16 - 14 (1989)
  • Camaro:
    • 5/16 - 18 (1967-1968, Firebird through 1967)
    • 3/8 - 16 (1969-1992, 1969-1981)
    • M16 x 1.5mm (1993-2002)
    • Non-threaded (2010 to present, 2013-up 6 speed - single screw attachment, 2016-2023 Gen 6)
  • Caprice: 9/16 - 18 (1967 4 speed)
  • Chevelle: 9/16 - 18 (4 speed)
  • Chevy II: 9/16 - 18 (4 speed)
  • Corvair: 5/16 - 18 (through 1963)
  • Corvette:
    • C1: 3/8 - 16 (1953-1962)
    • C2: 5/16 - 18 (1963-1967)
    • C3, C4, C5: 9/16 - 18 (1968-2004)
    • C6, C7: Non-threaded (2005 to present, requires special adapter)
  • Impala Sport Coupe: 5/16 - 18 (1959 4 speed)
  • Impala: 9/16 - 18 (1964-1966 4 speed)
  • K10 Truck: 3/8 - 24 (1967-1983 manual)
  • K3500 Truck: 7/16 - 14 (1993)
  • Monza: 1/2 - 20 (1980)
  • Nova: 1/2 - 20 (1972)
  • S10 Truck:
    • M10 x 1.50mm (1992, 1982-1995 5-speed only)
    • Non-threaded (1997, requires adapter)
  • Spark: Non-threaded (2014, requires adapter)
  • Truck (General):
    • 3/8 - 24 (1936-1946, 1967-1983)
    • 7/16 - 14 (1955 3100 Transfer Case, 1991 2500 Transfer Case)
  • Vega: 9/16 - 12 (1972-1976 manual, recessed for reverse lockout)
  • GM H-body: 9/16 - 12 (4 speed, info sparse)
  • GM S10/S15 Blazer/Jimmy: M10 x 1.50mm (1983-1995 5-speed only)
  • Chevette & T1000: M10 x 1.50mm (1982-1987 5-speed only)
  • Astro & Safari van: M10 x 1.50mm (1985-1989 5-speed only)

Chrysler (Brand Specific)

  • Most Manual Models: M8 x 1.25mm (newer)

Datsun

  • 240Z, 260Z, 280Z: M8 x 1.25mm
  • 300ZX: M10 x 1.25mm

Dodge

  • Challenger:
    • M8 x 1.25mm (2008 manual, newer manual)
    • M14 x 1.25mm (2015 and newer manual)
    • Non-threaded (2017+ automatic, requires adapter)
  • Charger: M8 x 1.25mm (newer manual)
  • Dakota: M10 x 1.50mm (1987-2009)
  • Dart: Non-threaded (2013 up, requires adapter)
  • Magnum: M8 x 1.25mm (manual)
  • Ram (Cummins): M10 x 1.50mm (most 5, 6-speed manual, e.g., 2006, 2005-2018 HD G56)
  • Ram 2500, 3500: M10 x 1.50mm (most 5, 6-speed manual)
  • Truck (General): 5/16 - 24 (1946-1955 manual)
  • Viper: 1/2 - 20 (manual)

Ferrari

  • 246 Dino, 308, 328, 348, Testarossa: M10 x 1.25mm

Fiat

  • 500: Non-threaded (2012 manual, requires adapter)
  • Spider: M10 x 1.25mm (2017 manual)

Ford

  • Bronco: 3/8 - 16 (1966, 1973-1977), 3/8 - 24 (1978-1981)
  • Fairlane: 1/2 - 20
  • Falcon: 1/2 - 20
  • Fiesta: M12 x 1.25mm (late model, 2015 manual recessed for reverse lockout)
  • Focus: M12 x 1.25mm (recessed for reverse lockout)
  • GT: M12 x 1.75mm (2005 manual)
  • Model A: 5/16 - 24 (1929-1931)
  • Mustang:
    • 1/2 - 20 (1964-1969 manual)
    • M12 x 1.75mm (1979-2004 manual)
    • M12 x 1.25mm (2005-2014 manual, 2015+ manual recessed for reverse lockout)
    • M10 x 1.25mm (2015+ GT350 manual recessed for reverse lockout, 2010-2014 Shelby)
    • 12mm x 1.75mm (Shelby Super Snake 2007)
    • 12mm x 1.25mm (Shelby 2007-2009 factory installed)
  • Pantera: M8 x 1.25mm
  • Probe: M10 x 1.25mm (manual)
  • SVT Contour: 1/2 - 20
  • Truck (General): Non-threaded (1982-2016 F-series, Ranger, requires adapter)

Geo

  • Storm: M10 x 1.25mm (manual)
  • Tracker: M12 x 1.25mm (manual)

GMC

  • Sonoma: M10 x 1.50mm (1992)
  • Truck (General): 3/8 - 24 (1936-1946)

Honda

  • Accord: M10 x 1.5mm (1985-2020)
  • Civic: M10 x 1.5mm (1983-2020)
  • CR-Z: M10 x 1.5mm (2010-2016)
  • CRX: M10 x 1.5mm (1984-1991)
  • Del Sol: M10 x 1.5mm (1993-1997)
  • Fit: M10 x 1.5mm (2007-2020)
  • Insight: M10 x 1.5mm (2000-2006)
  • Prelude: M10 x 1.5mm (1983-2001)
  • S2000: M10 x 1.5mm (2000-2009)
  • Most Models: M10 x 1.5mm

Hyundai

  • Genesis Coupe: M10 x 1.25mm (2008-2013)
  • Most Models: M10 x 1.25mm

Isuzu

  • Impulse: M10 x 1.25mm (manual)

Jaguar

  • Manual (through 1964): 5/16 - 18
  • Manual (general): 8mm x 1.25mm
  • X-Type: M12 x 1.25mm (2002 5-speed manual)

Kia

  • Forte: M10 x 1.25mm (manual)
  • Soul: M10 x 1.25mm (manual)
  • Most Models: M10 x 1.25mm

Lexus

  • IS200, IS250, IS300, SC300: M12 x 1.25mm (manual models)
  • Most Manual Models: M12 x 1.25mm

Lotus

  • Elise/Exige (2005-Jan 2009): M10 x 1.50mm
  • Elise/Exige (after Jan 2009): M12 x 1.50mm

Mazda

  • Mazda 2, 3, 6: M10 x 1.25mm (2003-2020)
  • Miata MX-5: M10 x 1.25mm (1989-2020)
  • RX-7:
    • M10 x 1.25mm (1979-1980, 1989-1995)
    • M12 x 1.5mm (1981-1988)
  • RX-8: M10 x 1.25mm (2004-2012)
  • Mazdaspeed 3, 6: M10 x 1.25mm (2006-2020)
  • Most Manual Models: M10 x 1.25mm

MG

  • Midget & 1100 Sedan: 5/16 - 18
  • MGB: 3/8 - 16

Mini Cooper

  • 1959-2000 (manual): 5/16 - 18
  • 2001 and Newer (manual): Non-threaded (requires adapter)

Mitsubishi

  • 3000 GT: M10 x 1.25mm (1990-2001)
  • Diamante: M10 x 1.25mm (1990-2005)
  • Eclipse: M10 x 1.25mm (1989-2012)
  • Evolution: M10 x 1.25mm (1992-2020)
  • Lancer: M10 x 1.25mm (1973-2020)
  • Most Manual Models: M10 x 1.25mm

Nissan

  • 180SX, 200SX, 240SX: M10 x 1.25mm
  • 280ZX: M8 x 1.25mm (1978-1983)
  • 300ZX: M10 x 1.25mm (1983-2000)
  • 350Z: M10 x 1.25mm (2003-2009)
  • 370Z: M10 x 1.25mm (2009-2020)
  • Altima: M10 x 1.25mm (1993-2012)
  • Maxima: M10 x 1.25mm (1988-2008)
  • Patrol: M10 x 1.25mm (1997-2020)
  • Sentra: M10 x 1.25mm (1985-2006)
  • Silvia: M10 x 1.25mm (1989-1998)
  • Silvia S15: M10 x 1.25mm (1999-2002), M12 x 1.25mm (6 speed 1999-2002)
  • Skyline: M10 x 1.25mm (1985-2002)
  • R34 Skyline GTR: M12 x 1.25mm (1999-2002, also Reverse Lockout System)
  • Most Manual Models: M10 x 1.25mm

Plymouth

  • Barracuda: 9/16 - 18
  • PT Cruiser: 3/8 - 16
  • Through 1965: 3/8 - 24
  • 1966: 9/16 - 18
  • Valiant: 3/8 - 24

Pontiac

  • Fiero: M16 x 1.50mm (manual)
  • Firebird: 5/16 - 18 (through 1967 manual), M16 x 1.50mm (manual 1993-2002)
  • GTO: Non-threaded (2004-2006, requires adapter)
  • Tempest: 3/8 - 16 (4 speed)

Porsche

  • 911/912 (1965-1969), 914 (1970-1976), 914-6 (1970-1972): M8 x 1.25mm (on newer RennShift sticks, older were 3/8"-24)

Scion

  • FR-S (Manual): M12 x 1.25mm (2011-2020, also Reverse Lockout System)
  • xA: M12 x 1.25mm (2004-2006)
  • xB: M12 x 1.25mm (2003-2020)
  • xD: M12 x 1.25mm (2008-2014)

Subaru

  • Baja: M12 x 1.25mm (2003-2006)
  • BRZ (Manual): M12 x 1.25mm (2011-2020, also Reverse Lockout System)
  • Crosstrek: M12 x 1.25mm (2018-2020)
  • Forester: M12 x 1.25mm (1998-2020)
  • Impreza: M12 x 1.25mm (1993-2020)
  • Legacy: M12 x 1.25mm (1993-2020)
  • Outback: M12 x 1.25mm (2000-2020)
  • STI: M12 x 1.25mm (2004-2020, also Reverse Lockout System)
  • WRX: M12 x 1.25mm (2002-2020)
  • Most Manual Models: M12 x 1.25mm

Suzuki

  • Samurai: M12 x 1.25mm (manual)

Toyota

  • 86 (Manual): M12 x 1.25mm (2011-2020, also Reverse Lockout System)
  • Celica: M12 x 1.25mm (1973-2005)
  • Hilux (Manual): M12 x 1.25mm (1988-2020)
  • MR2: M12 x 1.25mm (1984-2007)
  • Supra (Manual): M12 x 1.25mm (1978-2002, 6 speed also Reverse Lockout System)
  • Tacoma (Manual): M12 x 1.25mm (2005-2020)
  • Tundra (Manual): M12 x 1.25mm
  • Corolla (Manual): M12 x 1.25mm
  • Camry (Manual): M12 x 1.25mm
  • Land Cruiser FJ40 & FJ55: M10 x 1.25mm (1968-1983)

Volkswagen (VW)

  • Beetle: M7 x 1.0mm (1964-1968), M12 x 1.5mm (after '68, 1931-1996)
  • Corrado: M12 x 1.5mm (1989-1995)
  • Ghia: M12 x 1.5mm (after '68)
  • Golf (Manual): M12 x 1.5mm (1974-1996)
  • Jetta: M12 x 1.5mm (1974-1997)
  • Passat: M12 x 1.5mm (1996-2005)
  • Rabbit: M12 x 1.5mm (1974-1997)
  • Scirocco: M12 x 1.5mm (1974-1992)
  • Most Late Model: Non-threaded (requires specific adapter)

Volvo

  • 140 Series: 3/8 - 16