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  • rebuild your e15t box with n13 internals!

    You can rebuild your e15t box with n13 internals!

    1 st get n13 box...then the crown wheel(4.11:1)unbolts off the n13
    diff and bolts straght on to the ET diff(still using ET
    spidergears).
    Yes.

    Take the crown wheel from your n13 gearbox, and put it on your n12 diff.
    You'll find that the n13 diff just won't sit and spin in the n12
    bellhousing, which is why we reuse the n12 one, but with the appropriate
    gear diameter.

    You need to do this so that the final gear on the output shaft of the
    n13 gearset matches it's original counterpart, the crown wheel.

    > i also know that the gear train needs to be swaped over...but am
    > unsure of if it is a straight swap....

    Swap EVERYTHING.

    Pull everything that is n12 related out of your existing gearbox,
    hanging onto the diff.
    Keep the bellhousing part of the gearbox, aka the bit that bolts to the
    engine, you don't need the cover that goes over all the gears
    themselves.

    You then take the n13 input shaft, and put it in the n12 bellhousing,
    likewise with the output shaft. Keep the n13 selectors with the n13
    gears.

    Now, SWAP THE SELECTOR SHAFT.
    This is very important. Additionally, I found I even had to swap the
    reverse gear section that bolts through the side of the bellhousing on
    into the side of the input shaft.
    It's an ass to get out, you'll need a really big headed phillips
    screwdriver to get them out.

    So take this out of the n13 bellhousing, and put it in your n12
    bellhousing, along with the n13 selector.

    To remove the selector, it's actually in two pieces, you'll need to
    knock out the split pins (2, one inside the other) about half way down
    the selector - then you can get each half out.

    Basically everything gets swapped over. Oh with one nasty exception -
    the speedo drive, you use your original speedo drive BECAUSE the speedo pickup is *after* all
    the gear ratios, it's going at wheelspeed, not 'diff speed' hence no
    matter what gearset you have in there, the speedo is still spinning at
    the same speed as your wheels, so you don't use the n13 one. Another
    trap for the unlucky amoungst us.

    The dog selector gear has teeth on both sides of it. These are
    what crunch when you don't fully engage gears. They are all made the
    same, even the one that engages 5th gear. This means one side isn't
    used. So, when doing the re-assembly, this gear can be popped off
    and swapped end for end giving brand new never used teeth to mesh
    with. Just be a little careful as there are 3 locating pins which
    are spring loaded, these need to be pushed into place to allow the
    dog gear back on the shaft.
    This article was originally published in forum thread: rebuild your e15t box with n13 internals! started by mattybaby View original post