Subaru STi SHD DOGBOX KIT R4 PRO 6 speed

Due to the high level of inquiries received about our earlier version of the Subaru H-pattern kit (800Nm), we are releasing this SHD UPGRADED (up to 1200Nm) version again with the latest advanced technologies used in our products!

Engineered to fit the original Subaru case without modifications. Weight reduction of 10,5 kgs compared to the standard Subaru transmission! 
The Subaru R4 PRO kit has integrated an ultra lightweight aircraft grade aluminium CNC plate section that holds the new sequential mechanism and shafts.

Complete also with upgraded high strength gears and shafts, billet selector forks and billet selector rods made of the highest quality steel.

All parts are REM isotropic superfinished.

Using the standard Subaru gearbox housing, the sequential kit is designed for the racer looking to have a quick shift sequential gearbox and keeping budget in mind. Kit is supplied in assembly position for easy installation into the gearbox. No modification required!

Fast facts
  • Gearbox type: 6 speed full sequential gearbox
  • Gear shift layout: R-N-1-2-3-4-5-6-R-N-1-2...
  • R4 Kit Weight: 29kgs
  • Total gearbox weight: 76kgs (10.5kilos lighter than a standard 6 speed STI gearbox)
  • Maximum torque: 1000NM
  • Tooth profile: Straight cut
  • Shift performance: 30 - 40 milliseconds

Complete, ready to install gearboxes

We at X Shift offer installation of H-pattern DOGBOX kits into your original gearboxes.

This service includes:

  • Cleaning (sandblasting or aquablasting) of casings and inspection of all parts 
  • Front differential check and adjustment 
  • Setting teeth clearance of final hypoid drive
  • Installation of the DOGBOX kit 
  • Check/repair DCCD center differential
  • Check/change drop gears condition
  • Check of gearbox wiring harness
  • Possibly replacement of necessary OEM parts 

 

Note: The reward for this service is the delivery of your own OEM TY856 gearbox in the best and most complete condition. Non-standard parts can be ordered upon agreement. The gearbox is sent back in a cushioned tailor-made box along with the original OEM parts. 

Occasionally we are also able to source a 6MT donor gearbox, intended for rebuild purposes. 

KIT INCLUDES

  • BILLET shifting mechanism with dog engagement
  • INPUT Shaft and OUTPUT Shaft
  • GEARS 1st - 6th +
  • SHIFTING Forks
  • SHIFTING Selector Rods
  • BEARING and NEEDLE Bearing Set
  • INLET /OUTLET for oil cooler

Our kits also come with parts of the shifting mechanism that are more reliable and stronger than those found in stock, or competitor's gearboxes. Reinforced pars are based on extensive fatigue testing of serial components.

RATIOS AVAILABLE

  MR-N5 MR 1 MR 2  C1  C2 C3   C4
1. 3,10 2,64 3,33  3,33 3,33 3,33   2,91
2. 2,42  2,87 2,38  2,38  2,38 2,14   2,08
3.  2,00  2,27  1,87 1,80  1,80 1,59   1,56
4.  1,67 1,80  1,53  1,41 1,37 1,26   1,21
5.  1,39 1,43  1,28  1,15  1,05  1,05  1,00
6.  1,17  1,16  1,09  0,94  0,83  0,90  0,83
Subaru R4 PRO MR-N5 = 175km/h at 6500rpm
Subaru R4 PRO MR1 = 176km/h at 6500rpm
Subaru R4 PRO MR2 = 187 km/h at 6500rpm
Subaru R4 PRO C1 = 215,5 km/h at 6500 rpm
Subaru R4 PRO C2 = 243 km/h at 6500 rpm
Subaru R4 PRO C3 = 226,9 km/h at 6500 rpm
Subaru R4 PRO C4 = 243km/h at 6500rpm

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