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Nissan Skyline GT-R OS-88 6-speed sequential gearbox by OS Giken
OS Giken OS-88 6-speed sequential gearbox
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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 digital shift indicator and pull-up reverse lock-out sleeve.
It can be used with the factory GT-R shift lever but we recommend the optional 'direct shift kit' for shorter throw and less play.

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, but does require regular inspection to ensure trouble-free 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

Please contact us if you would like to choose one of the following "option" ratio sets ($1000 extra):
Option 1: 2.609, 1.934, 1.521, 1.210, 1.000, 0.785
Option 2: 2.890, 1.981, 1.468, 1.174, 1.000, 0.757
Option 3: 2.516, 1.865, 1.468, 1.174, 1.000, 0.822

Note that this gearbox uses a larger 26-spline input shaft (not Nissan 24-spline).
It is recommended to order a matching R3C or R4C OS Giken clutch to go with this gearbox.
Typical delivery time is 2-3 months, but this can vary depending on the number of back-orders.
If you have any questions about this product please contact us directly on 02 8677 4890

We are currently sponsoring Paul Torony's S13 Silvia drag car, which uses one of these gearboxes, with the transfer case modified to suit a RWD applicaiton. Here is a video of the car in action:
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Girraween NSW 2145

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