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Thread: Series 11A gearbox upgrade

  1. 13th June 2017, 06:34 PM #1
    Trudi.hill.defndagirl
    Trudi.hill.defndagirl is offline Member Silver Subscriber
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    Series 11A gearbox upgrade

    Hi everyone... my first of many more questions I'm sure.
    I am restoring an ex military 11A but want to replace the gearbox with a full synchro box. Can anyone tell me what suffix I need to look for? Or anyone got one for sale?
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  2. 13th June 2017, 07:53 PM #2
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    Slunnie
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    Check this out. It may help.

    Series Gearbox ID
    Cheers
    Slunnie


    ~ Discovery II Td5 ~ Discovery 3dr V8 ~ Series IIa 6cyl ute ~ Series II V8 ute ~
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  3. 15th June 2017, 04:21 PM #3
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    JDNSW
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    The simple answer is to replace it with a Series 3 box. You will have to replace the clutch as well and the pipe to the slave cylinder as it is on the opposite side. (Which makes for easy identification.) A few very late Series 2a were fitted with a slightly different all synchro box, but even if you find one (unlikely) I do not suggest this as parts could be a problem.

    The general consensus is that the all synchro Series 3 boxes are weaker than the late 2a boxes, and give more trouble, but this should not be an issue if it is treated reasonably.
    John

    JDNSW
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  4. 24th June 2017, 08:21 AM #4
    Gumnut
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    IIa gearbox

    Unless you have a real early IIa, stick with the current box...

    if you have a real early one, with small lay shaft rear bearing, go for a later IIa box, or, order a few lay shafts, bearings and gaskets. The box is usually pretty forgiving when things go bang in the night (unlike the III box)

    gumnut
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