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OS Close Ratio Gear Set

The ratios of each OS gear set are determined through extended research and actual race track tests, making it possible to use the performance of your highly modified engine to its full extent.
Carefully selected quality materials are used, and every gear is forged for extra strength. Metal surface processing called "hard shot peening" is also used on the gears so that they can withstand heavier load for reliability.
OS Cross Gear sets are designed for maximum quality with no compromises made to reduce production costs.


Close-ratio Cross Gear Sets
Set of 3 close ratio gears (1st, 2nd, 3rd) for GTR26DETT GTR (also RB25).
 $2460
Two types (O.E. Transmission or Holinger sequential) to choose from.
Set of 5 close ratio gears with reinforced input shaft for GTR26DETT GTR (also Z32•RB25).
 $2850
Two types (O.E. Transmission or Holinger sequential) to choose from.
Set of 3 close ratio gears (1st, 2nd, 3rd) for SR20DET (FR models).
 $1800
Not applicable to Skyline Turbo.
Set of 5 close ratio gears with reinforced counter shaft for SR20DET (FR models).
 $2400
Not applicable to Skyline Turbo.
Set of 5 close ratio gears with reinforced main shaft, counter shaft and input shaft for SR20DET (FR models). $2850
Not applicable to Skyline Turbo.
Set of 5 close ratio gears with reinforced input shaft for FC3S RX-7 $2450  
Set of 5 close ratio gears with reinforced input shaft for FD3S RX-7 $2450  
Set of 3 close ratio gears for Toyota R154 (7M-GTE/1JZ-GTE) $1750  
Set of 3 close ratio gears for Mazda MX5 $1480  
Set of 3 close ratio gears for Honda Civic or Integra $998  
Set of 5 close ratio gears for Honda Civic or Integra $1780  

Optional Parts for Cross Gear Sets
Reinforced input shaft for GTR26DETT GTR (also RB25)  (O.E./Holinger)
 $580
Final gear kit for MAZDA MX5 1600cc 4.555 (O.E.: 4.100)
 $980
A spacer at the pinion gear will be needed to install Final gear kit. (T=3.08-3.47)
Final gear for DC2 98-spec 4.643/4.929 Two ratios available (O.E.:4.786)
 $480
Not applicable to forced-induction engines.
Final gear for EG6, EK4, EK9, DC2 4.267/4.533 Two ratios available (O.E.:4.400) $480
Not applicable to forced-induction engines.

Transmission Ratio List
Applicable Models Transmission Type
 1st gear 2nd gear 3rd gear 4th gear 5th gear


RB26DETT GTR(Z32•RB25)
 FS5W30A
 A
 2.695
 1.703
 1.236   0.826
(in 5-gear set)
 Designed for final version of this gearbox (as used in 1998 R33 GT-R). Older gearboxes will require updated Nissan parts. Email us for parts list.
RB26DETT GTR(Z32•RB25)
 FS5W30A
 F 2.599
 1.669
 1.198
  
RB26DETT GTR(Z32•RB25)
 FS5W30A
 G 2.516
 1.669
 1.198
  
0riginal Ratio
 FS5W30A
   3.214 1.925
 1.302
 1.000 0.752  
SR20DET(FR) 3-gear set
 FS5W71 C
   2.717
 1.722
 1.232
  

 

 Not applicable to Skyline Turbo
SR2ODET(FR) 5-gear set
 FS5W71 C
   2.717
 1.722
 1.232
  

0.805 or 0.835 See *3

 Reinforced countershaft enclosed
SR20DET(FR) 5-gear set w/input shaft
 FS5W7 1 C
   2.596
 1.765
 1.250
  

0.833
Original Ratio
 FS5W71 C
   3.321
 1.902
 1.308
 1.000

0.759

  
FC3S RX7 5-gear set w/input shaft
 R5M-D
   2.578
 1.772
 1.289

1.000

 0.821
 Need genuine Mazda parts. O.E. 5th gear is used. See *4
FD3S RX7 5-gear set w/input shaft
 R15M-D   2.578
 1.772
 1.289

1.000

 0.821
 Need genuine Mazda parts. O.E. 5th gear is used.See *5
Original Ratio
     3.483
 2.015
 1.391

1.000

 0.806
  
1JZ, 7M-G
 R154
   2.701
 1.614
 1.215
     Several types are offered. See *6
Original Ratio
 R154
   3.251
 1.955
 1.310

1.000

    
MAZDA MX5 (1600cc)
 R5M-D/M15M-D
   2.604
 1.639
 1.228
     Specify VIN and code of your car to order. See *7
MAZDA MX5 (1800cc)
 R5M-D/M15M-D
   2.604
 1.639
 1.228
      
Original Ratio
 R5M-D/M15M-D
   3.136
 1.888
 1.333
 1.000
    
DC2 Integra 98 Spec 3-gear set
   3-B 3.077
   1.600
 1.261
   Not applicable to forced-induction engines.
EG6 •EK4 •EK9 • DC2 3-gear set
   3-A 3.077
   1.600
 1.261
   Not applicable to forced-induction engines.
DC2 Integra 98 Spec 5-gear set
   5-B 2.818
 2.000
 1.471
 1.136
 0.926 Not applicable to forced-induction engines.
EG6 • EK4 • EK9 • DC2 5-gear set
   5-A 2.818
 2.000
 1.471
 1.136
 0.926 Not applicable to supercharged engines.
Original Ratio     3.231 2.105 1.458 1.107 0.848  

*1 5th gear for RB26DETT is optional. Price is $750.
*2 Genuine Nissan parts will be needed when model changed transmission is equipped.
*3 5th gear for SR20DET can be chosen from two different ratios.
*4 R5M-D transmission (equipped to pre-minor changed FC3S) needs a spacer (MAZDA part # R502-17-316) and roller bearing (MAZDA part # R502-17-306A) to install the kit. See service manual for installation.
*5 R15M-D transmission (equipped to minor changed FD3S or later) needs a spacer(MAZDA part # R502-17-316) and roller bearing (MAZDA part # R502-17-306A) to install the kit. See service manual for installation.
*6 The kit varies depending on the production period and model. Please contact us before ordering.
*7 When the engine is 1600cc, specify VIN and code to order.

OS88 Sequential Transmission

A new release from OS Giken, the OS88 is a 6-speed racing sequential gearbox designed for the GT-R. Supra and RX7 versions are under development. Rated power handling is 1500hp.

Transmission Ratio List
Applicable Models 1st gear 2nd gear 3rd gear 4th gear 5th gear 6th gear
RB26DETT GTR 2.609 1.934 1.521  1.210 1.000 0.852