Z31 Transmission Specifications and Variations
The Z31 came with three different manual 5 speed transmissions and 2 different Automatics.
Manual Transmission Specifications
The Z31 came with three different manual 5 speed transmissions. All manual non-turbos used a 5 speed Nissan transmission (FS5W71C) which is quite reliable. The 84-86 manual turbos used a Borg-Warner T-5 5 speed (FS5R90A). The 87-89 manual turbo transmissions are a Nissan made (FS5R30A) model. Internally, they are the same as the Nissan transmission found in z32 turbos, trucks, pathfinders, etc. The 1987 model FS5R30A has a little different gear set than the 1988 and 1989.
All manual transmissions have synchros on all forward gears. If you change the gear oil in your transmission on a semi-regular basis it should give you absolutely no trouble at all.
Manual Gear Ratios
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|
1984-1989 Non Turbo FS5W71C
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1984-1986 Turbo
FS5R90A
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1987 Turbo
FS5R30A
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1988-1989 Turbo
FS5R30A
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1st Gear
|
3.321
|
3.350
|
3.324
|
3.324
|
|
2nd Gear
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1.902
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2.056
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2.077
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2.077
|
|
3rd Gear
|
1.308
|
1.376
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1.360
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1.360
|
|
4th Gear
|
1.000
|
1.000
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1.000
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1.000
|
|
5th Gear
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0.759
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0.752
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0.751
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0.711
|
|
Reverse
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3.636
|
3.153
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3.382
|
3.382
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Manual Transmission Fluids Levels
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Transmission Model
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Model Z31
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Fluid Capacity
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Fluid type
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FS5W71C
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1984 - 1989 Non Turbo |
4-1/4 pt
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API GL-4
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|
FS5R90A
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1984 - 1986 Turbo |
4 pt
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API GL-4 (SAE 80W-90) or type DEXRON |
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FS5R30A
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1987 - 1989 Turbo |
5-1/8 pt
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API GL-4
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Manual Transmission Weight
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1986 - 1989 Non Turbo FS5W71C
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1984 - 1986 Turbo T-5 FS5R90A
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1987 - 1989 Turbo FS5R30A
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|
94lbs (No fluid, Clutch fork, Throwout bearing, or Shifter)
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102.2lbs with throw out bearing included and all switches (neutral, revrese, etc) Shifter Removed
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Unknown
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Automatic Specifications
The Z31 was offered with two different Jatco Automatic Transmissions. They were both model E4N71B and featured and electronic lockup feature.
These transmissions are based on the light duty model L4N71B transmission used in the Datsun 810. The E4N71B can provide lockup in all forward speeds by using a microprocessor to electronicaly control the lockup.
The overdrive switch in the automatics has a temperature sensor that does not allow the transmission to shift into overdrive until it is sufficiently warmed up to avoid possible damage.
Level 10 use to makes an upgrade kit that would allow your transmission to hold up to 500+ hp but it is no longer available.
Automatic Gear Ratios
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|
4N71B
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E4N71B
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1st Gear
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2.458
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2.458
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2nd Gear
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1.458
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1.458
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|
3rd Gear
|
1.000
|
1.000
|
|
4th Gear
|
0.686
|
0.686
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|
Reverse
|
2.182
|
2.400
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Automatic Transmission Fluids Levels
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E4N71B
|
4N71B
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|
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Fluid Type
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Auto Trans DEXRON
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Auto Trans DEXRON
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Capacity
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7-3/8 qt
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7-3/8 qt
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Specifications And Adjustments
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Interchange
All Z31 transmissions are completely interchangeable. They have no problems bolting up to the motor. One problem is they don't always mount to the body correctly. You may have to drill and tap new holes for the transmission mount.
 |
| Transmission Mount Bolt Holes (1986 Non Turbo Automatic Model Shown with a FS5W71C Installed) |
Each transmission has it's own output shaft size and overall length. Finding the appropriate driveshaft for a two seater is no problem. Just find another two seater that had the same transmission and take that driveshaft. If you have a four seater, you're going to have a more difficult time. Only in Canada did the North American market get a turbo four seater. And almost all of them were automatics. So you'll need to find the appropriate driveshaft for the transmission you just bought and have the driveshaft lengthened. If you get a FS5W71C, there are plenty of 2+2 5 speed models around.
The Z32 manual transmissions can also be installed although with some modification. A 89-91 Maxima SE Flywheel is needed as is modification to the stock shifter and transmission mount. More Information on this swap can be found here.