Difference between the N/A Diff and the T2 diff on a fc

• Difference between the N/A Diff and the T2 diff on a fc by FCs Rule on 23 May, 2010 00:08
• Ok so I have been looking around for information about the Rx7. I had some pics that i found a long time ago on my hard drive and so i put them up on photobucket. Everything in the pics are labeled which is NA and which is T2. i hope this helps out some!
  
  
  
  
  
  
  
  
  
  ^ the bigger one is the T2
• #1 by andrewb70 on 23 May, 2010 01:43
• Those measurements in millimeters are off, or maybe they just need a decimal point somewhere. 1000mm = 1m = about 39 inches.
  
  Andrew
• #2 by mattster03 on 27 Jun, 2010 15:33
• can someone confirm the following:
  
  1986-1988 TII diff = clutch type
  1989-1991 TII diff = torsion
• #3 by mpcv2000 on 27 Jun, 2010 21:50
• I have a 89 Turbo II and if I'm not mistaking the rear end ( differential ) unlocked on me a few times , is it possible ?
  
  I'm used to clutch type diff. so we can rebuilt them but looks like the 89-91 is different. Can I have it rebuilted ?
  If not , can I swap a 86-88 Clutch type in it and keep my gears ?
  
  
• #4 by digitalsolo on 27 Jun, 2010 21:56
• Quote from: mattster03 on 27 Jun, 2010 15:33

  can someone confirm the following:
  
  1986-1988 TII diff = clutch type
  1989-1991 TII diff = torsion
  

  
  Confirmed.
• #5 by RXTC on 27 Jun, 2010 22:01
• Quote from: mpcv2000 on 27 Jun, 2010 21:50

  I have a 89 Turbo II and if I'm not mistaking the rear end ( differential ) unlocked on me a few times , is it possible ?
  
  I'm used to clutch type diff. so we can rebuilt them but looks like the 89-91 is different. Can I have it rebuilted ?
  If not , can I swap a 86-88 Clutch type in it and keep my gears ?
  
  
  

  
  you can swap the pig, and be done with it.
  
  
  
  

  Quote from: digitalsolo on 27 Jun, 2010 21:56

  Quote from: mattster03 on 27 Jun, 2010 15:33

  can someone confirm the following:
  
  1986-1988 TII diff = clutch type
  1989-1991 TII diff = torsion
  

  
  Confirmed.
  

  
  Second that confirmation.
• #6 by bikedad on 28 Jun, 2010 00:18
• From what I understand about the TII diffs are:
  
  S4 has equal length stub shafts
  S5 has unequal length stub shafts
  
  If you pop them out you should be able to differentiate between them.
  
  86-88 (S4) is clutch type
  89-91 (S5) is torsion
  
  
• #7 by mpcv2000 on 28 Jun, 2010 12:56
• Quote from: bikedad on 28 Jun, 2010 00:18

  From what I understand about the TII diffs are:
  
  S4 has equal length stub shafts
  S5 has unequal length stub shafts

  
  
  That means if I swap a S4 differential in my 89 Turbo II I will need to find S4 Stub shaft too ?
  
  I'm writing down my shopping list.   
• #8 by digitalsolo on 28 Jun, 2010 13:00
• Handy picture:
  
  
• #9 by jim3 on 29 Jun, 2010 03:10
• Thank you Shaun and Blake.  A little more and this should be made a sticky.
• #10 by mattster03 on 03 Jul, 2010 20:08
• Thanks for the confirmation guys... I'm going to head down to pick up my '88 TII diff this weekend... $150
• #11 by FCs Rule on 04 Jul, 2010 12:57
• well to isn't it 87 88 t2 and then 89-92? there are some rare 92s out there
• #12 by 383mazda on 29 Jul, 2010 20:34
• Is there  way to tell from the outside what year TII rear you have?  If not which is the easier way to tell, pop the diff cover off and look inside or pull the stub shafts out and measure them  (p.s. I have never peaked into or taken apart a diff, I just know I have a TII diff in my garage with matching axles... but I don't know if it's the clutch style or not)
• #13 by josh18_2k on 29 Jul, 2010 21:04
• S5 diffs are viscous.  US FC's never got the torsen, but apparently JDM efini's did.  FD diffs are all torsen.
• #14 by Speedfab on 25 Aug, 2010 11:14
• TorSEN people, torSEN
  
  Torsion - the twisting of an object by an applied force/torque
  Torsen - short for TORque SENsing differential