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[Datsun 1200 encyclopedia]

71-Series Transmission

From Datsun 1200 Club

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Category: Transmission Modifications

The 71 transmission is Nissan's strongest transmission. It was fitted to L-series six cylinders, SR, KA 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 design of 1969. Finally the even stronger 71C came out in the mid-1980s.

Contents

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, so you know it's strong.

th_ipodphotos212.jpg

Although the Nissan 90-Series Transmission was rated higher, experience shows that the 71C is practically just a as durable even behind a 300ZX turbo (see Gearbox Strength).

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 (L3N71B), so a 1200 automatic Tunnel should fit them.

album

71A 1969-1970 Fairlady 5-speed
71B 1975-1983 5-speed
71C 1984-1998 5-speed
3N71 automatic

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

A stumpy is a gearbox that is 26.3" long overall. It fits in a Datsun 1200 perfectly with shifter in the correct location.

See main article: Stumpy

71 Original

F4W71

Short 4-speed with flanged output 
* 1969-1972 Datsun 521 with L16 engine
Short 4-speed with sleeve-yoke output 
* 1972-1973 Datsun 620 with L16 engine
Long 4-speed 
?

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

Short housing
* Datsun 720 with Z-series engine (short 26.3")
(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
* Datsun 610
* 1977-1980 Datsun 810 L-series six-cylinder
* 1974-1979 Datsun 620 with L18 or L20B engine
* 1979 Datsun 720 with L20B engine
* 1980-1982 Datsun 720 with Z-series engine (long 31.5")

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 - The 71C has a different shifter than the 71B and all versions are longer than the 71B. A 71B front housing can be swapped.

NORTH AMERICA
1983- Nissan 300ZX (non-turbo, turbo uses 90-series)
1986-1989 Nissan D21 (Hardbody) with Z-series engine
1989- Nissan D21 (Hardbody) with KA-series engine
Pathfinder/Xterra/Frontier with KA-series engines
Pathfinder/Xterra/Frontier with VG-series (V6) engines
Engines
VG-series (V6)
KA-series
Z-series

Interchange

Like transmission parts interchange:

* 71A bell housings swap (U20 bell or L-series bell)
* 71B 4-speed parts swap to other 71B 4-speeds
* 71 5-speed parts swap to other 71 5-speeds
* 71B/71C front cases can interchange after some mods

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

L-series and Z-series/KA-series use the same bell patttern -- BUT the L-series is a slant engine. So while the transmissions will physically bolt on, use the Z-/KA front case with the Z-series engines, and the L-series front case with the L-series engines. OR, you can bend the gearshift to the appropriate angle, but you risk transmission oil leaking out as the gearbox will now be installed on a slant.

Swap Notes

Z-series transmission into B210

photo

photo

Sources

Europe

D21

D21 KING CAB EUR 2WD MT KA24, Z20, TD25
FS5W71C
32010-07G63 0586-1087 Z20
32010-56G00 0492-1292 Z20S <> 32010-56G01
32010-56G01 1292-0594 Z20S <> 32010-2S400
32010-25G02 1087-0492 TD25 <> 32010-05G63
32010-56G10 0492-1292 TD25 <> 32010-56G11
32010-56G11 1292-1095 TD25
32010-1S800 1095-
REAR EXTENSION ASSY 
32130-05G11 0594-
32130-05G10 0895- <5> 32130-05G11

North America

720

The north america parts catalog lists the following.

WHEELBASE
LONG (includes King Cab)
REG 2575 mm (101.4")

32010 TRANSMISSION ASSEMBLY
32100 CASE ASSY-TRANSMISSION
32110 COVER ASSY-FRONT
23138 PLATE-ADAPTER
32130 EXTENSION ASSY-REAR

* L20B used from introduction 0679-0680
* SD22 Diesel 0679-1082
* SD25 Diesel 1182-
* Z22 from 0880-1082
* Z20 from 1182-0784
* Z20 from 0784-
* Z24 from 1182-0784
* Z24 from 1183-
* Z24 from 0784-
* Z24I from 0485- (I = central fuel injection)
L20B 4-speed + 5-speed
0679-1179 Aluminum Front Cover
1279-1082 Aluminum Front Cover
1179-1082 Cast Iron Front Cover
Cast Iron Front Cover
L20B later (some)
SD25

D21

USA
REAR EXTENSION ASSY - F5
32130-05G11 0487-     Z24/SD25/KA24E
32130-05G10 1185-0487 Z24/SD25

Tail Housings

EXTENSION ASSY-REAR

ER30 32130-E9911 also C31
HR30 32130-E9912 also C31 with neutral switch
12"
* 32130-E9912/32130-E9957 Z24 2WD 0784- (except CAL STD)
16"
* 32130-E9801
* 32130-E9802
* 32130-E9407
??"
* 32130-E9803 L20B 1279-0680 
* 32130-E9408
* 32130-E9311 
* 32130-E9321 
* 32130-E9302
* 32130-54W10
* 32130-45W10
* 32130-54W10
* 32130-45W02
* 32130-45W01
??
MAIN SHAFT 71C 
[shifter positioned forward]
 32241-95P00/95P01/95P09 <5,7> 
  RB20 GEARBOX
  32130-73L00 EXTENSION HOUSING
[shifter positioned rearward]
 32241-91P00/32241-50F00/32241-V5010/32241-V5270 <7,7>
 * S13 JAP,USA
 * Z31 USA

4-speeds

L20B

F4W71B 4-speeed for L20B 
* 32010-44W05 FED 2WD long + 4WD regular
* 32010-45W05 CAL 2WD long + 4WD regular
* 32010-B9860 CAL 2WD regular
* 32010-B9960 FED 2WD regular

Z22

F4W71B 4-speed for Z22 engine
* 32010-05W00 2WD regular
* 32010-46W00 4WD [both wheelbase]
* 32010-Q4900 Heavy Duty [both wheelbase]

5-speeds

L20B

FS5W71B

0679-0680
* 32010-44W06/32010-44W16 King Cab 4WD FED
* 32010-45W06 King Cab 4WD CAL
0679-1179 
* 32010-B9910/32010-B9912 King Cab 2WD + non-KC CAL 
* 32010-B9911 King Cab 2WD + non-KC CAL FED
1279-0680
* 32010-B9912 King Cab 2WD + non-KC CAL
* 32010-B9913 King Cab 2WD + non-KC FED

Z-Series

Z20
* 32010-61W01 1182-0784
* 32010-82W01/32010-82W15 0784-
Z22 
* 32010-05W10 0780-1082 2WD
* 32010-18W00/32010-46W10 4WD
Z24 OPTION FS5W71B with 16" extension housing
* 32010-20W16/32010-20W15 King Cab + 2WD 0784-
Z24
* 32010-55W06/32010-55W10 4WD 0183-
Z24 12-inch extension
* 32010-80W15/32010-80W16 2WD 0784-
Z24I
* 32010-90W00 0485-
* 32010-90W15 0485-
* 32010-90W16 0485- 4WD

SD Engine

* 32010-V2400/32010-Y8401 SD22 0679-1082 
* 32010-19W15 SD25 1182-

Ratios

C = Servo type synchros
W = Warner type synchros

22984.jpg

1984-1998 gearset FS5W71C e.g: 300ZX USA
* 1st: 3.321
* 2nd: 1.902
* 3rd: 1.308
* 4th: 1
* 5th early 0.759
* Reverse: 3.382
1980-1983 gearset mid/close e.g: 280ZX USA
* 1st: 3.062
* 2nd: 1.858
* 3rd: 1.308
* 4th: 1
* 5th early 0.773
* 5th late: 0.745
* Reverse: 3.026
1976-1979 gearset wide/ratio e.g: JDM 810 Bluebird 
* 1st: 3.321
* 2nd: 2.077
* 3rd: 1.308
* 4th: 1
* 5th early 0.864
* 5th late: 0.816
* Reverse: 3.382
Input Drive
* 22 teeth main shaft
* 31 teeth counter gear
* input ratio = 31/22 = 1.409
Overdrive (5th)
* 19/31 main/counter * input = 0.864 (810 -7806)
* 22/38 main/counter * input = 0.816 (810 7806-)
4th
* 1:1 (direct drive)
3rd
* 26/28 teeth main/counter * input = 1.308
2nd
* 28/19 teeth main/counter * input = 2.077
1st 
* 33/14 teeth main/counter * input = 3.321 
Reverse
* 36/15/15 teeth main/counter/reverse * input = -3.382

Input Ratios

28:23 = 1.217 FS571A (Roadsters and early Z, close spreads)
31:22 = 1.409 (most cars)
32:21 = 1.524 (most trucks and heavy cars. This ratio effects a wider spread)
32:18 = 1.778 (Commercials with widest spread for underpowered vehicles)

Input Shaft

S14 5-speed input shaft
* O.D.: 1"
* Spline: 24 teeth
* Pilot Bushing Inside Diameter: 0.626 to .6300" (Length: .689")
* Pilot Bushing Outside Diameter: .814 to .815"

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This page has been accessed 12,900 times. This page was last modified 06:51, 12 August 2015. Content is available under Datsun 1200 Club.