71-Series Transmission

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The 71 transmission is Nissan's strongest transmission. It was fitted to L-series six cylinders, FJ engines and more. 71 series comes in four different lengths, however a stumpy version is the same length as a Datsun 1200 transmission though obviously much larger around. The stronger 71B replaced the original 71A designs in the 1970s.

Overview

The 71-series has the mainshaft and countershaft 71 mm apart. This larger transmission is thus stronger than the 56-series used in the Datsun 1200, and stronger than the 63-series used in some A14-powered B210s. The C revision boxes (FS5W71C) was used with 3-liter V6 engines.

While never offered in an A-series version (it would be overkill even for a supercharged A-engine), the 71 is a good choice for larger engine swaps.

71 series is also the size of the Datsun 1200 Automatic Transmission, so an automatic Tunnel will fit them.

Lengths

Long extension housing is the most common.

Overall Transmission Assy Length
Long tail #1: 31.5 inches
Long tail #2: ? inches
Tail #3: ? inches
Short tail: 26.3 inches (stumpy)

Stumpy

• 71-Series Transmission
  • Skyline DR30 (FJ20 engine with 71C)
  • Datsun 720 pickup USA (71B)

Skyline DR30 transmission

71A

F4W71A Long housing

• 1969-1971 240Z 4-speed

FS5C71A Long housing

• Removable bell housing
• Datsun Roadster with U20 bell
• Datsun Roadster with R16 bell
• Datsun 240Z early USA dealer installed with L-series bell

71B

Look for 71B cast into the transmission case.

F4W71B

(1972-1982) long housing. Rear extension of transmission has bolt-on cover plate.

• 1972-1973 Datsun 240Z
• 1974 Datsun 260Z
• 1975-1978 Datsun 280Z
• 1979 Datsun 280ZX
• 1974-1978 Datsun 620
• 1979 Datsun 720 with L20B engine
• 1980-1982 Datsun 720 with Z-series engine
• 1975-1980 Datsun 810/Maxima six-cylinder

FS5W71B

Long extension housing

• Datsun 200SX (S110) with Z20 engine
• Datsun Maxima (810) with LD28 diesel
• Nissan 720 with SD diesel
• Nissan 200SX with CA18ET engine
• Datsun 720 long tail
• 1977-80 Datsun 280Z
• 1979 280ZX (non-Turbo)
• Datsun 810
• Datsun 620

Short extension housing

• Datsun 720 stumpy/shorty

Engines
L-series (various)
Z-series (S110)
LD28 diesel (Maxima)
SD diesel (Nissan 720)
CA18ET (Nissan 200SX)

71C

FS5W71C
Nissan 300ZX (non-turbo, turbo uses 90-series)
early Nissan D21 (Hardbody) 

VG-series (V6)
Z-series 

Interchange

Like transmission parts interchange:

• 71A bell housings
• 4-speed to 4-speed
• 5-speed to 5-speed
• 71B/71C front cases

Complete transmission units of the same length interchange. For example, replacing a shorty FS5W71B with a shorty FW471.