Resource: Subaru CV Axle Database

While researching for a potential modification (making hybrid axles), I found it very difficult to get good information on OEM Subaru CV axles. Most of the info was scattered across various forums and even then it was inconsistent. So to make heads or tails of this information I decided to put it into a table.

I will update this table as I find new information.

Cliff Notes

Starting with GD chassis, WRX rear axles (aka – 5×100/R160) have 24/25 spline rear axles. The GR chassis switched to bolt-in bearings with 27 splines so the GR WRX (08-14) has 27/25 rear axles. All STIs as far as I can tell have 27/27 rear axles. The LGT Spec B with the R180 has unique 25/27 rear axles.

YearModelAxle LocationOuter CV Joint Splines (Hub)Inner CV Joint Splines (Trans/Diff)Shaft SizeShaft Spline Count
(Outer/Inner)*
Axle LengthSource
1999ForesterRear242523mm#5
2000-2002RSRear242523mm#1
2001Legacy Outback
2002-2005WRX (Sedan)Front2728mm29?#1, #7
2002-2005WRXRear242524mm21 or 22
2004STIFront2727
2004STIRear272730/30#6
2005-2007STIFront2729?/30
2005-2007STIRear2727
2006-2007WRXFront2725#1
2006-2007WRXRear2428
2008-2014WRXFront27
2008-2014WRXRear272528?#3
2008-
2014
STIFront27
2015-202XSTIRear2727
2004FXTRear242522#4
2006-2009LGT Spec BRear2527
*Shaft spline count is very inconsistent and can vary greatly within the same model year.

Sources

  1. https://forums.nasioc.com/forums/showthread.php?t=367808
  2. http://wordpress.suberdave.com/?page_id=275
  3. https://www.wrxforums.com/threads/r180-into-08-wrx.23397/
  4. https://forums.nasioc.com/forums/showthread.php?t=2048240&page=8
  5. https://forums.nasioc.com/forums/showpost.php?p=3969011&postcount=2
  6. https://forums.hybridz.org/topic/73182-subaru-sti-r180-differential-and-axle-conversion-revised/
  7. https://thefactoryfiveforum.com/showthread.php?11112-Internal-CV-Spline-Mismatch

2 Comments

  1. Jake says:

    I built hybrid axles for one of my wagons so I could run an r180 with 5×100 4pot/2pots. I combined 22 spline 04-05 wrx rear axles with 06 STI inner cups using Suberdave inner races.
    I had to buy a bunch of donor axles before I found some with the correct shaft spline count. Two sets I purchased were definitely oem from bugeye wrx cars and the axle shafts had 21 splines.

    Like

    1. A.A.Smith says:

      I appreciate the info. I might need to do something similar fairly soon.

      Like

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