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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 most common 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

Swap Notes

No need to cut anything. If you get the right transmission it will fit into the unmodified tunnel. The typical way is to remove the front crossmember, jack up the car, then slide the assembled engine/transmission combination under the car, then lower the car down.

However if you use a long-tail Silvia gearbox you'll have to cut an opening for the shifter further back. Obtain a Stumpy 71 to avoid this cutting.

Too long -- shifter way back
2118.jpg

Some choose to cut a wider opening into the 1200 firewall so that the engine/gearbox combo can be angled in from above.

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.

S13 Silvia/180SX Transmission

  • Most 71-series gearboxes will need a box section cut into the shifter area to clear the shifter area on the gearbox. To avoid this, obtain a Stumpy 71
  • Gearbox fits the 1200 tunnel width and opening. However it is a tight fit and the gearbox can't be removed or installed with the engine in place (see above). If you want easy installs, the tunnel may be replaced with a 1200 Automatic tunnel which is designed for 71 gearbox (or fit a tunnel from a 120Y, which is virtually identical). See main article: Tunnel

Crossmember

All gearbox options for the 71 will need you to fabricate (or get someone to fabricate) a new gearbox crossmember to attach the gearbox to the floor of your car. In the case of a stumpy 5 speed just a piece of 40mm box steel will do the job. Bolt it to the rubber mount of the stumpy and then bolt it to the floor - add some spacers as required. Here a pic of a crossmember I made. (It only gets wider at the edges as I had some existing holes in the floor of the Datto I wanted to use.)

th_100_4647.jpg

th_100_4665.jpg

Silvia mount insulator
full

Into Sunny

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"

Speedometer Gears

63 uses a longer sleeve than the 71

Early 71 and Late 71 differ.

  • pre-1980 speedometer gear sleeve key is on bottom
  • post-1980 speedometer gear sleeve key is on top

Late 71B & 71C use the same gears.

D21 71C
* TO JUN 1993 - cable drive
* FROM JUL 1993 - speed sensor
32707-C8302 SLEEVE FOR 17-19T
* also fits GC22.Z24I
32703-N9017 17T
32703-N9018 18T
23703-N9019 19T

Speed sensor gear VS cable drive gear
album

25010Y SENSOR ASSY-SPEED METER
  32703 PINION-SPEEDOMETER
32702 PINION ASSY-SPEEDOMETER
  32707 SLEEVE-SPEEDOMETER PINION
  32712 PIN-RETAINER, SPEEDOMETER PINION
  32703 PINION-SPEEDOMETER
  32743 PINION FOR SPEED SENSOR
Z31.VG30.71C + Z31.VG30T.R90A+R30A
32707-58S10 SLEEVE
32703-78101 17T (VG30T)
* Fits S110,S130.L28E+L28ET,Z31
32703-78102 18T (VG30, VG30T)
32703-78103 19T (VG30T)
S12.CA20E+CA18ET
* TO JAN 1986 71B
* From JAN 1986 71C
32707-58S00 SLEEVE FOR 20-21T <> 32707-R5600
32707-58S10 SLEEVE FOR 18-19T <> 32707-R5620
32703-78102 18T
32703-78103 19T
32703-78104 20T
32703-86401 21T
?
32703-86402 22T
32703-86403 23T
32703-78100 16T
* S130
32703-78101 17T
* S110,S130,Z31
S13.KA24E+KA24DE
25010-35F00 SPEED METER SENSOR
32743-35F20 20T
32743-35F21 21T
720.USA 
* F4W71B
* FS5W71B

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