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Mar 26, 2014

Nissan Skyline GT-R Transmissions and Upgrades

There were two main transmissions used in the Nissan Skyline GT-R's from 1989-2002.  The R32 and R33 used a 5 speed transmission from Nissan(FS5R30A), and the R34 GT-R used a 6 speed transmission from Getrag V160(FS6R93A). 

The FS5R30A is very similar to the 300ZX transmission internally. The Getrag is similar to the transmission used in the MK IV Toyota Supra. The input shaft and main shaft are unique to the GT-R on both transmissions, the rest of the internal parts are interchangeable if you have the right version of the gearbox. There were some running changes, and not everything is the same. 

Transmissions with and without transfer cases
Transmissions with ATTESA transfercases attached

Below is some information I have gathered through the years about Nissan Skyline GT-R transmissions. Not all the latest stuff is on the list. There are a few more PPG options now, few more other things you can do, but most of the information is good. All wheel drive cars are hard, hard, hard on the transmission. When the wheels don't slip, the hard parts break. Third gear is a big one in R32/R33. Bang third gear hard, and it will let go. Some people say the late R33 box is stronger, but I have tried them all, and broken them all. Once, twice in a week in a 500 hp R32 with a nasty clutch(unsprung HKS/Tilton). You want a sprung hub, you want to run Redline Shockproof Heavy gear oil in most trans(not the V160).

The Getrag is loud at idle. The synchros aren't that durable. Even though the Supra guys run them pretty hard, we break weird hard parts in them. Sequentials take some getting used to. Fun, but you have to treat them like a race box(which they are). They require frequent rebuilds if you are 1/2 way serious. Some gearboxes have helical cut gears, some have straight cut gears.

If its a street car, or you ever really plan on driving it on the street, do yourself a favor, and get helical cut gears. I put about 2000 street miles in an R32 with a PPG trans. Straight cut, dog engagement. The whine from the gearbox cruising on the highway way pretty annoying. Louder than the 4 inch exhaust, and the Weldon fuel pump.  Your mileage may vary, but the pitch and tone of it, isn't a good sound for a long time. Its 2024, and there are a few more options available, including pure drag race only Powerglides and Turbo400's. Then there are also DCT and 8HP options

Nissan gearbox codes F = Floor Shift S = Overdrive 5 = five forward gears R30 = gearbox series A = first revision

Engines using 30A gearboxVG30,VG33,VG35, RB25DET,RB26DETT,QD32, RD28T
Applications using the FS5R30A

Z31 1987-1989 Fairlady with VG30DE
R32 Skyline with RB26DETT
R33 Skyline with RB25DET, RB26, OR 4WD
R32 Skyline with RB25DET or 4WD
R50 Terrano
D22 Datsun Truck with QD32
AWC34 Stagea with RB20E,RB20DE,RB25DE,RB25DET
WC34 Stagea
WD21 Terrano with VG30E
Y60 Safari with RD28T
Z31 1986-1989 300ZX with VG30DT Turbo
Z32 1990-1996 300ZX with VG30DE or VG30DTT
D21 Hardbody pickup VG30
WD21 1992-1995 Pathfinder VG30I,VG30E
D22 Frontier VG33E
WD22 Xterra VG33E, VG33ER
R50 1996- Pathfinder VG33, VG35

Getrag V160
V160 6 speed Getrag in an R34 N1. Notice the AN fittings for the transmission cooler. 

Samsonas Nissan Skyline GT-R sequential gearbox

OS Giken gearset. This goes in the stock case, and takes OEM parts. 

OS Giken has several different gearsets available for the R32 and R33 transmission. Prices range from $2370 to $3350

NS201-GA 3-speed close ratio gear kit Ratios:2.695/1.703/1.236/
NS201-GL 3-speed close ratio gear kit with 5th gear Ratios: 2.695/1.703/1.236/1.000/0.826
NS201-GM 3-speed CRGK with Reinforced input (standard or Hollinger type Available) Ratios: 2.695/1.703/1.236 (6-D)
NS201-GN 3spd CRGK w/5th gear & Reinforced input shaft (standard or Hollinger type Available) Ratios: 2.695/1.703/1.236/1.00/0.826 (17-D)

The OS Giken kits, are just that kits to replace the gears. They also have their OS88 sequential transmission .

What can help a stock geared, or even an OS Giken geared 5 speed transmission, is a billet center plate. We find that flex in the OEM center plate contributes to failures of 3rd gear. When anything breaks, is always up to car, clutch, fluid, driver, tires.

OS Giken Crossmission (Close Ratio transmission) 4.111 front and rear diffs
A type.
1. 2.695
2. 1.703
3. 1.236
4. 1.000
265/35/18 tires Speed in gears
120 mph
149 mph
RPM drop with 8000 rpm shift
8000 rpm
5000 rpm
5700 rpm
6400 rpm

F type
1. 2.599
2. 1.669
3. 1.198
4 1.000
265/35/18 (?) tires Speeds in gears
57 mph
89 mph
124 mph
149 mph
RPM drop with 8000 shift

G type
1. 2.516
2. 1.699
3. 1.198
4 1.000
265/35/18 (?) tires Speeds in gears
59 mph
89 mph
124 mph
149 mph
RPM drop with 8000 shift

Option 5th gear
5. .826

265/35/18 (?) tires . Speed in gear 8000 rpm
181 mph

4-5 shift rpm drop
6600 rpm

OS88 sequential Transmission
OS Giken Sequential Transmission - Page 1
1. 2.609
2. 1.934
3. 1.521

HKS version 1
1 2.519
2 1.820
3 1.300
4 1.000
5 .807
6 .650
275/40/17 8000 rpm
59 mph

8500 rpm
62 mph

9000 rpm
67 mph

9500 rpm
72 mph

HKS version 2
1 2.701
2 1.904
3 1.343
4 1.000
5 .832
6. .734

Quaife - 6 speed Dog engagement
1. 2.782
2. 1.938
3. 1.506
$ 7,395.00 - fits in stock gearbox

Greddy - Grex - 6 speed Dog engagement
1. 2.782
2. 1.938
3. 1.506
Made by Quaife

Route 6
1 2.605
2 1.715
3 1.244
4 1.000
5 .752

Holinger H6S transmission. Bolts up to R32/R33 engine and transfer case

Holinger H6S- 6 speed sequential 

Available Ratios

Normal R32/R33
1 3.214
2 1.925
3 1.302
4 1.000
5 .752
275/40/17 -
46 mph
114 mph
148 mph
197 mph

RPM Drop on 8000 shift
8000 rpm
4750 rpm
5400 rpm
6250 rpm
6000 rpm

Final Ratio - 4.111

Normal R34
2. 2.360
3. 1.685
4. 1.312
5 1.000
6 0.793
45 mph
73 mph
102 mph
131 mph
172 mph
217 mph
Final Ratio- 3.545

Speedtek Close Ratio Gearset

Speedtek close ratio gearset for R32 GT-R

I have noticed the guys from Speedtek for several years. They had a well priced close ratio gearset for the RB series transmissions. RB26 and RB25 FS5r30a.  I wanted to try out a set, and recently I was in contact with them. 

1st 2.69
2nd 1.69
3rd 1.24
4th 0.99
5th 0.70

Speedtek gearset, 255/50/16 tire, 4.375 gears, 8500 rpm shifts

Speedtek billet center plate for FS5R30a transmission

OS Giken Crossmission gearset

Crossmission, or close ratio transmission

Stock GT-R gearsets. Both have broken 3rd gear.

OS Giken - OS88 - Sequential 6 speed transmission

The OS88 is comprised of synchro-less helical cut gears and is the perfect complement for a tuned RB26DETT motor. It can be ordered with 4 different sets of gear ratios to suit almost any engine power profile and racing purpose. 

Gear ratios:

Standard: 1st – 2.609 / 2nd – 1.934 / 3rd – 1.521 / 4th – 1.210 / 5th – 1.00 / 6th – 0.852
Option ratio 1: 1st – 2.609 / 2nd – 1.934 / 3rd – 1.521 / 4th – 1.210 / 5th – 1.00 / 6th – 0.785
Option ratio 2: 1st – 2.890 / 2nd – 1.981 / 3rd – 1.468 / 4th – 1.174 / 5th – 1.00 / 6th – 0.757
Option ratio 3: 1st – 2.516 / 2nd – 1.865 / 3rd – 1.468 / 4th – 1.174 / 5th – 1.00 / 6th – 0.822

Optional Parts:
Release Bearing Set
Adjustable Fork Kit
OS88 Exclusive Transmission Crossmember (allows extra 40mm of road clearance)
Center Alignment Tool
Direct Shift Lever Kit
Heavyweight Shift Knob

OS88 Manual in English

Getrag Transmission Rebuild

The Getrag uses Nissan part KLD40-00004 transmission fluid or oil

Getrag with a conversion kit for an ATS carbon clutch

How to remove a pull style throwout bearing in a late R32,R33, or R34 Nissan Skyline GT-R transmission. Watch the video. Its easy when you know how. 

Pull style throw out bearing on a NISMO twin plate clutch for R34 GT-R

Pull style throw out bearing on a NISMO twin plate clutch for R34 GT-R

Nissan Skyline GT-R Transmission and clutch parts and part numbers

Clutch Pull to push conversion- Late Model R32, R33

Front cover assembly :32110-05U11 (japan part only)
Gasket :32112-05U12
Clutch fork :30531-01S00 (same part for a 1991-1993 240SX)
Spring :30514-14600
Spring :30534-E9000
T/O bearing :30502-14601
Bearing sleeve:30501-S0160 / 30501-N1601 (14mm for twin / trip disc)
Bearing sleeve: 30501-K0404 (24mm for single disc)
Dust cover :30542-31610
Slave cylinder :30620-21U01
Flywheel bolt: 12315-04U00
Crank dowel: 13032-18000

Late R32 bellhousing. This has bosses for push and pull clutch. It is currently a push clutch, or early. 

Factory Clutch
R32 GTR(There are early and late R32, so double check this)
Disc- C0100-05U15
Cover-30210 - 05U01
Bearing- 30502-21000
Disc- 30100-21U01
Cover- 30210-21U00
Throw out bearing- 30502-12U00 (300ZX part) or 30502-45P00 (300ZX part)
Bearing Sleeve- 30501-S0200 (18mm)
Disc- 30100-0V708
Cover- 30210-24U00
Bearing- 30502-12U00
Disc- 30100-0V708
Cover-30210 - AA300
Bearing- 30502-12U00

Updated 3rd, 4th and 5th gear trans part (R32-R33)
32606-30P10 Coupling sleeve
32251-30P14 2nd gear
32604-30P60 ring 5th
32261-12014 3rd gear
32604-30P61 ring
32811-05U10 shift fork
32611-AA510 Coupling sleave
32609-70L15 Shifting insulator X3
32201-05U71 Main drive gear
32604-40P61 ring
32605-30P11 Hub
32603-30P00 Spring shifting X2
32212-AA504 Counter gear
32230-054U24 First gear
32137-AA500 Plate
32341-30P04 Over drive gear ( 5th gear )
32245-30P60 Reverse gear
32220-30P60 Reverse gear
32614-30P60 Ring
32615-30P60 Shifting insulator X3
32214-01G21 Counter
32616-30P20 Coupling sleeve
32282-30P61 Reverse gear
32320-VB361 Shaft
32139-VB300 retainer
32312-30P24 gear
32320-VB361 shaft
32139-VB300 retainer

Throw Out Bearing Sleeves

Depending on what clutch, and flywheel you are running, you may need a new throw out bearing sleeve for the early, push style clutches. The height listed is from the front side of the fork to the seat position of the bearing.

OS Giken Super Single and Multi Plate Clutch Notes


Unknown said...

Hello, and sorry to bother you with this. I've loved the R32 since i was a child, and this past october I was able to import one (HCR32). It has a stage 3 competition clutch in it, but I wanted to upgrade the transmission because A) it's starting to have issues, and B) im pumping more horsepower into it (550) and im pretty sure im going to tear it up. I saw in your blog the OS Giken and wanted to know if you have any insight into attaching the current clutch to a RWD R34 transmission. I wanted the 6-speed as well as the durability of those transmissions. Outside of aggressive shifting on the street, I dont take it to the track.. it's kinda my baby, and im just making it pristine and picking up that S16 when it comes out. Any help in combining the clutch to transmission would be helpful, or if there is already something that is optimized to drop in that would work for me would be really appreciated. Thanks again.

Sean Morris said...

You want to put a Getrag V160 in it?

Clutches are pretty simple things. The hardest part is getting the matching sets of parts so that you have enough free play, with actuation distance. That all has to do with which flywheel, and clutch cover you are using. Its a bit of a puzzle. Anyone with experience can do it. Its why its easiest to stick to known combinations that work, unless you can figure those things out based on peoples past experience, or though some math and measuring.

Anonymous said...

I think you might be on some drugs mate, or simply, your crap at shifting gears. I have built for myself and customers multiple R32 and R33 Gtr skylines, running stock 5 speeds well in excess of 900awhp and 9 second passes and have also built several R34 skyline GTR's with the Getrag running over 1100awhp for several years, with no problem, whatsoever!
R34 Synchros are far more durable then that of the r32/33 gear boxes and yes the Series 3 {97/98} R33 Skyline boxes will see over 900awhp as well and happily live with, serviced well and driven CORRECTLY.
you don't need to slam gears to make quick shifts, which seems to be pretty evident if you breaking stock boxes, let alone PPG boxes.....
something to seriously consider is researching a topic of others experiences before shit canning the boxes, like you inherently have done.
AWD systems aren't "hard, hard, hard' on the drive line at all, poor driver ability is!
if it where, then we would see far MORE box breakages in the industry then what we do.

Sean Morris said...

This is based on 17 years experience with these gearboxes, in hundreds and hundreds of cars all over the world. If all you do is hardpark, you probably wont break them. If you run them hard, they break. If you don't break them, you are the exception, not the rule. Doesn't take a genius to figure out why there are so many tranmission upgrades for GT-R's. They break when you drive them hard. When you hardpark, not so much.