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All synchro box into S2

Discussion in '"Stock" Alpine' started by lemansvk, Jan 22, 2007.

  1. lemansvk

    lemansvk Donation Time

    One of my local friends has an SII (non-synchro OD) and is considering putting an SV all-synchro OD box into it. What issues will he face, and how can he overcome them. I have a feeling that there are clutch issues, but the rest is straightforward?

    Thanks in advance, Vic
     
  2. Wombat

    Wombat Donation Time

    Vic,

    As far as I know (and that may not be very far) the differences are:

    Clutch: The Series II and other non-synchro cars used a clutch pressure plate with coil springs. The synchro IV and V used a diaphragm spring pressure plate. Expect differences in the release lever, the pivot and the thrust bearing. Possibly also the master cylinder and push rod.

    Driveshaft: May need to have the length adjusted. Measure the overall length of both gearboxes. If they are the same all should be OK.

    One other thing: If it was a really late Series V, the box may have 25 spline input and output shafts so you will need a different clutch plate and driveshaft front yoke.

    Other than that remember: Reverse is now to the RIGHT and back!!
     
  3. Wombat

    Wombat Donation Time

    Vic,

    As far as I know (and that may not be very far) the differences are:

    Clutch: The Series II and other non-synchro cars used a clurch pressure plate with coil springs. The synchro IV and V used a diaphragm spring pressure plate. Expect differences in the release lever, the pivot and the thrust bearing. Possibly also the master cylinder and push rod.

    Driveshaft: Will need to be shortened. An Autobooks Series V manual I have lists the length between U-Joint centres as 32.35" for non overdrive and 29.5" for overdrive. My Series IV (all synchro non overdrive) has a driveshaft that is 31 13/16" between centres. Measure carefully!

    Other than that remember: Reverse is now to the RIGHT and back!!
     
  4. Drnobeam

    Drnobeam Donation Time

    Hi Vic, I installed a SV tranmission with overdrive onto my S2 with no problem. The SV tranmission bolted right up to the clutch, using S2 bellhousing, clutch, release bearing, slave, etc.

    I did need the the SV driveshaft for the yoke to fit the 25 spline output shaft of the tranmsiion/overdrive. I also had to shorten the driveshaft to fit the OD, which shouldn't be a concern for your friend because they already have an OD. You would still need the 25 spline SV yoke for your existing S2 driveshaft.
     

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