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OS Giken Gearbox
OS Giken

The OS Giken OS-88 gearbox is a sequential 6-speed gearbox designed to suit the BNR32 and BCNR33 GT-R.

The OS Giken OS-88 gearbox is a sequential 6-speed gearbox designed to suit the BNR32 and BCNR33 GT-R.



It can also be used in the BNR34 but will require an R33 transfer case and  front prop shaft.
It bolts up to the Nissan transfer case and has a bellhousing to suit any RB engine.
It also comes complete with shifter, digital shift indicator and pull-up reverse lock-out sleeve.

  • OS-88 Sequential Transmission - made to order 3months.
  • OS-88 Transmission Member - made to order 3months. Optional
  • Note : OS-88 is not included a Transfer (Red circle of the picture)
  • Includes shift indicator and the shifter

Instruction for BNR34.
1. The Transfer is used with for BCNR33.  33100-23U00 - Nissan OEM Transfer 
2. The Speed Meter Gear Unit is used with for BNR34
3. The propeller shaft is used with for BCNR33
37300-24U00 - Propeller Shaft Front 
37200-05U00 - Propeller Shaft Rear
4. Clutch disc is used with exclusive product.
5. Clutch Sleeve and Bearing is used with exclusive product
6. Need to change Pull to Push. Then needs the following parts.
30620-21U01 - Nissan OEM Operating Cylinder 
30531-01S00 - Nissan OEM Release Fork 
30534-E9000 - Nissan OEM Pivot Spring 
30514-14600 - Nissan OEM Sleeve Spring 


OS Giken designed this sequential gearbox to handle 1500hp, while retaining quiet helical-cut gears.
To do this the gear axis has been increased to 88mm, while most internal parts are forged.
The dog-engagement of the gears allows extremely fast shifting operation.This gearbox comes with the following gear ratios:

1st 2.609
2nd 1.934
3rd 1.521
4th 1.210
5th 1.000
6th 0.852

Product Version Vehicle Compatibility Price Order
30514-14600
Nissan OEM Sleeve Spring
Skyline - R34 GTR - BNR34
USD $ 12.05
Vehicle Compatibility
Nissan - Skyline - R34 GTR - BNR34
30531-01S00
Nissan OEM Release Fork
Skyline - R34 GTR - BNR34
USD $ 28.87
Vehicle Compatibility
Nissan - Skyline - R34 GTR - BNR34
30534-E9000
Nissan OEM Pivot Spring
Skyline - R34 GTR - BNR34
USD $ 11.58
Vehicle Compatibility
Nissan - Skyline - R34 GTR - BNR34
30620-21U01
Nissan OEM Operating Cylinder
Skyline - R34 GTR - BNR34
USD $ 69.01
Vehicle Compatibility
Nissan - Skyline - R34 GTR - BNR34
33100-23U00
Nissan OEM Transfer
Skyline - R34 GTR - BNR34
USD $ 2,101.32
Vehicle Compatibility
Nissan - Skyline - R34 GTR - BNR34
37200-05U00
Propeller Shaft Rear
Skyline - R34 GTR - BNR34
USD $ 1,193.71
Vehicle Compatibility
Nissan - Skyline - R34 GTR - BNR34
37300-24U00
Propeller Shaft Front
Skyline - R34 GTR - BNR34
USD $ 996.40
Vehicle Compatibility
Nissan - Skyline - R34 GTR - BNR34
BNR32 OS-88 Sequential Transmission
Nissan Skyline BNR32 RB26DETT - 1X Transmission, 1 X Trans member, 1 X OS Clutch Kit R3C for BNR32 with Sleeve Bearing, 1 X shift indicator and the shifter, OEM normal transfer not included
Skyline - R32 GTR - BNR32
USD $ 13,565.36
USD $ 15,267.72
Vehicle Compatibility
Nissan - Skyline - R32 GTR - BNR32
OS CSB
Clutch Sleeve and Bearing
Skyline - R34 GTR - BNR34
USD $ 74.70
USD $ 83.97
Vehicle Compatibility
Nissan - Skyline - R34 GTR - BNR34
OS-88 Kit
13 - Indicator Unit, 18 - Connect Cable, 19 - Black Box, 20 - Sensor Cable + Indicator Kit
Skyline - R32 GTR - BNR32
Skyline - R33 GTR - BCNR33
Skyline - R34 GTR - BNR34
USD $ 663.67
USD $ 858.81
Vehicle Compatibility
Nissan - Skyline - R32 GTR - BNR32
Nissan - Skyline - R33 GTR - BCNR33
Nissan - Skyline - R34 GTR - BNR34
OS-88 Sequential Transmission
Sequential Transmission
Skyline - R34 GTR - BNR34
USD $ 9,653.45
USD $ 10,687.40
Vehicle Compatibility
Nissan - Skyline - R34 GTR - BNR34
OS-88 Sequential Transmission
Transmission Member
Skyline - R34 GTR - BNR34
USD $ 430.97
USD $ 477.12
Vehicle Compatibility
Nissan - Skyline - R34 GTR - BNR34
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Nengun Performance
NENGUN CO. LTD
4798-455 Imazu
Nishi-ku, Fukuoka
Japan, 819-0165

Kobutsuho No.
901080810037