R33 Gearbox Conversion Kit - Factory (S15)

R33 Gearbox Conversion Kit - Factory (S15)
Price: $2,350.00
Availability: Pre-Order


*All prices exclude GST(Tax) and will be calculated during checkout. International customers do not pay tax*

*Pictures are for illustration purposes only and may differ to your order*



You love your S15.

You DON'T want to hammer, bash, cut, trim, or modify your chassis at all.

You want the perfect fitment and the perfect feel, the way it should've came from the factory.



With 10 full years of engineering S15-specific drivetrain solutions we now introduce:
R33GCK-Factory: RB25DET R33 Gearbox Conversion Kit - Factory Fitment (also fits* the RB25DET R34 gearbox):

  • Factory shifter location
  • Factory shifter feel
  • Factory shifter movement
  • Factory gearbox fitment
  • No chassis modifications
  • No gearbox tilt
  • Your interior trim fits like factory
  • Huge selection of aftermarket gearsets and upgrades available

"How's this possible??!?!?!!" The answer lies in re-engineering the shifter setup on the R33 / R34 RB25DET gearbox, and then everything else neatly fell into place. So let's talk about the shifter setup first...

R33GCK-Factory: Shifter Setup Re-Engineered To Suit The S-Chassis




We've re-engineered the RB25DET gearbox's shifter setup so it comes out right in the middle of the standard S15 shifter chassis hole. There are no tricks, no weird movement, no odd feels - just honest to goodness hardcore engineering and precision manufacturing.

Here are the differences between the similiar yet different Z32GCK and R33GCK-Factory.

By following the provided step-by-step full colour printed instruction manual you disassemble the gearbox, install the Alpha Omega Racing shifter parts, then re-assemble the gearbox - the shifter will then pop out right in the middle of the S15's shifter hole - just like factory.

R33GCK-Factory: Perfect Shifter Position


The results are:

  1. Shifter position is now perfectly in the middle of your standard shifter hole
  2. Shifter movement is perfect H-pattern
  3. Shifter feel is perfect
  4. No cutting or modifying any metal
  5. No cutting or modifying any plastic
  6. No hammering or bashing or massaging or love tapping your chassis
  7. All your interior trim fits back in perfectly
  8. All functions work perfectly like factory including reverse lockout, return to centre, reverse sensing and neutral sensing

R33GCK-Factory: Perfect Shifter Position



  1. CNC machined high-carbon billet steel components for the ultimate in solid, precise shifting feel
  2. CNC machined aerospace billet aluminium components for light weight and corrosion resistance
  3. 17.5% shorter-throw with the OEM Skyline standard shifter
  4. Anodised Type II (Steel cannot be anodised)

R33GCK-Factory Installed In An S15: Perfect Shifter Position and Perfect Shifter Feel




In all the years we've made gearbox adapters we have had exactly zero issues and zero complaints and zero problems: we got this down pat. It wasn't really all that difficult... just expensive; CNC machines are repeatable 24/7, the CMM is accurate to 0.001mm, and we didn't take shortcuts - it's one thick billet piece of alloy to ensure rigidity and reliability, keeps all 4 genuine OEM Nissan alignment dowels in their original locations and then added other little thoughtful features.

It uses 19 high tensile bolts to secure the gearbox onto the motor which is more than anything else out there. We are the only company that have done the following; we mapped out extra-but-blanked holes in the R33 gearbox, then we machined corresponding holes into our billet adapter, then give you instructions on exactly where and how to drill out those holes. A wonderful side benefit of the thick billet adapter and the most bolts used in any conversion kit available is that it gives you increased engine reliability! Autospeed states Nissan "...concentrated on the rigidity of the engine (and of the engine/trans combination, which used 10 connecting bolts) by using a main bearing girdle, the two-piece sump and the closed-deck block."

CNC Machining The Full Ring Thick Billet Alloy Engine-to-Gearbox Adapter


This product is engineered specifically for the S15 / 200sx / Silvia - no flywheel spacer is used, and no bellhousing machining is required!

The results are:

  1. Input shaft spline centrelines are perfectly aligned - this means all S15 flywheels and clutches will fit; single, twin, triple, quad
  2. Perfect engine/gearbox alignment by retaining all 4 OEM alignment dowels and positions
  3. Perfect starter motor alignment
  4. Easy starter motor servicing
  5. Increased engine rigidity and reliability


  1. CNC machined billet 1-piece alloy for accuracy, rigidity and reliability
  2. CMM accurate to 0.001mm
  3. 19 bolts to secure the gearbox onto the motor
  4. OEM genuine Nissan alignment dowels included
  5. Reliefs for dust and dirt where necessary
  6. Anodised Type II

CNC Machined: Finished




We heard it was overkill for the cross member to be CNC machined billet alloy, and we also heard complaints about sheet metal welded cross members not fitting properly on some raced, drifted, dragged, bent, crashed, repaired chassis'. We'd rather hear complaints about price rather than complaints about things not fitting or working properly so here's our solution: a 3-piece billet CNC machined cross member giving you adjustability in all directions.

CNC Machined 3-Piece Billet Alloy Cross Member, Multi-Adjustable and Raises The Skyline Gearbox To The Factory Silvia Angle


Because of the perfect shifter position it is now possible to raise the gearbox back to the correct angle without cutting, hammering or smashing anything - a first for any gearbox swap in any Silvia ever! You'll notice the up-swept angle of the cross-bar to achieve zero tilt on the drivetrain - zero tilt on the engine, zero tilt on the gearbox (obviously), and zero tilt on the tailshaft. No more vibrations, no more scraping gearboxes, and no more wearing out unijoints. You don't have to worry about your engine hitting your aftermarket carbon fibre hood or stretching out your wiring or hoses or do any intercooler or exhaust piping modifications either.


  1. 3-piece design; adjustable in all directions for an easy fit
  2. The gearbox angle is perfect - not lowered or raised from the factory angle
  3. Guaranteed perfect install
  4. Anodised Type II

CNC Machined 3-Piece Billet Alloy Cross Member, Multi-Adjustable and Raises The Skyline Gearbox To The Factory Silvia Angle




DOES NOT require machining of the RB25DET gearbox to fit into the Nissan Silvia S15 / 200sx / Silvia, saving you time and money.


No flywheel spacer is used here. Re-use your current S15 flywheel and clutch kit, or use any aftermarket S15 flywheel/clutch kit - all single and multiplate clutches are compatible with the Alpha Omega Racing design.


Alpha Omega Racing raises the back of the gearbox to the original height without cutting or bashing metal. Using our R33GCK-Factory the gearbox is tilted 0º (zero degrees).


All necessary bits and bobs are included for a quick install, you will not have to run out to the shop to buy anything else and you use your current gearknob too!


Included is a printed copy of the step-by-step instruction manual with full colour pictures, surprisingly handy to have next to you during the install. Any licensed mechanic will be able to carry out the installation and no specialist tools are required.



  • Factory like fitment and feel
  • Shifter is perfect in every way
  • No hammering or cutting or modifying of any metal or plastic in your chassis
  • Re-use your current flywheel and clutch kit, or any made for your S15 / 200sx / Silvia
  • Made and engineered in Australia so you know it's done right

R33GCK-Factory Installed In An S15 




The R33GCK-Factory includes everything needed to install and adjust the R33 gearbox:

  1. 1-piece CNC machined billet aluminium gearbox adapter plate
  2. 3-piece CNC machined billet aluminium cross member, multi-adjustable
  3. 7-piece CNC machined billet aluminium + billet high-carbon steel shifter set up with 17.5% short-shift function
  4. 2x CNC machined billet aluminium clutch fine tuning rings
  5. 2x genuine Nissan OEM alignment dowels
  6. CNC machined billet steel S15 gear knob adapter
  7. Zinc coated silver spring pin
  8. Zinc coated high tensile silver nuts, bolts and other hardware
  9. Printed full step-by-step installation instructions with colour pictures

You need the following parts to make it all work:

  1. A R33 (or R34*) Skyline RB25DET manual gearbox (with its sensors, shifter and slave cylinder)
  2. A tailshaft

Some modifications are necessary. 

Made in Australia




This product is engineered to work with the rear wheel drive Nissan Skyline R33 / R34 RB25DET 5 speed manual gearboxes code FS5W30A with 40mm input shaft spline length and the push-style clutch release mechanism.

The R34 model RB25DET Skyline gearbox is "pull-style" but you can use it here when you convert it over to the R33 "push-style". The good thing about the R34 gearbox is it's the last revision of these gearboxes with the least mileage. To do the pull-to-push conversion you need the following items:

  1. R33 gearbox front cover plate including the clutch pivot ball
  2. R33 clutch slave cylinder
    • Optional NISMO large clutch slave cylinder
    • The R34 bellhousing has provisions to mount the R33 slave cylinder but the holes are blind, you will simply drill and tap these blind holes. You re-use your Silvia's clutch fork, throw out carrier and bearing

One last thing you need to know is that the shifter bushes are different sizes; you need an R33 shifter bush on your shifter.

Alpha Omega Racing: Engineering The Limit.

R33GCK-Factory: R33 Gearbox Conversion Kit - Factory Fitment



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