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Inautomotive design, anR4, orrear-engine, four-wheel-drive layout places theengine at the rear of the vehicle, and drives all four roadwheels.

This layout is typically chosen to improve thetraction or thehandling of existing vehicle designs using therear-engine, rear-wheel-drive layout (RR).

The R4 layout is very rare, only having been used on a small number of production vehicles. Notable vehicles with this layout include several high-performancePorschesports cars, including the959, the911 Turbo since the introduction of theturbocharged version of the993 series in 1995, and the 911 Carrera 4 introduced with the964 series in 1989.

SomeVolkswagen Kübelwagen (the rear-enginedbeetle-basedmilitary vehicle used by Germany inWorld War II) variants were produced with 4-wheel or all-wheel drive, including the Type 86, Type 87, Type 98. Also, someVanagons/Microbuses came in 4WDSyncro version.

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  Porsche 959, rear-engine, four-wheel-drive, top speed of 197 mph to 211 mph
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  Porsche 993 Turbo
• 
  Porsche 964
• 
  Porsche 911 Dakar
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  Volkswagen Transporter Syncro 4WD truck
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  Volkswagen Syncro 4WD Van
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  Volkswagen Syncro 4WD
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  Volkswagen Transporter Syncro 4WD
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  1989 Volkswagen Caravelle Club Westfalia Syncro
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  1989 Volkswagen Caravelle Club Westfalia Syncro
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  Volkswagen T3 Tristar Syncro (1990)
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  WW2Volkswagen Kübelwagen

• Ludvigsen, Karl (2003).Porsche. Excellence Was Expected. Vol. 3. Cambridge, Mass.: Bentley Publishers.ISBN 0-8376-0235-1.^{[page needed]}
• Taylor, Blaine (2004).Volkswagen Military Vehicles of the Third Reich. Cambridge, Massachusetts: Da Capo Press.ISBN 0-306-81313-0.OCLC 55534990.^{[page needed]}
• Road Trippers, Syncro^{[dead link]}

• Porsche - 1989 Porsche 911 Carrera Coupé, Cabriolet, Targa, Speedster, and 4 Coupé
• Porsche - 1989 Porsche Turbo 911 Coupé, Cabriolet, and Targa
• Information on and about Porsche 993
• Porsche 911 Carrera 2 (Generation 993) Exterior and Interior in Full HD 3D - YouTube
• Syncro -Driving Americas with VW Westfalia 4x4 Extreme Adventure - YouTube

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