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I'm not sure offhand what the 320 was, but those axles look like an issue waiting to happen... they look like about 15sp? Unless they're the ones you replaced.
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PIGDOG wrote:
seems that its the same width as the 1500 diff (which comes with alloy housing)
Bluebird axles will be a fair bit to wide, and will need to be cut down and resplined, but i dont know if they are wide enough to clear the undersized part
also the 720 and 1500 wheel bearing arrangement is much different to the normal passenger car wheel bearing arrangement. being that they use tapered bearings with adjustable preload all contained in a bolt on "hub" kinda thing
the axles are also threaded at the wheel bearing for the adjustable collar
so to use bluebird axles you would need to cut the ends off the diff and weld the bluebird style ends on to allow you to use bluebird wheel bearings. and if you were doing that its not much of an effort to cut the diff down to 1200 width
another option i was looking at if the axles werent going to be long enough to allow resplining was r31 axles. they are big enough to be resplined to the h190 spline even in the undersized part of the axle
but you still have the problem of the different wheel bearing setup on the 720 diff. so still need bluebird style ends and then you need to find a wheel bearing with bluebird bearing OD and r31 bearing ID, then same deal with the seal as bluebirds have it on the inside of the bearing and r31s have it on the outside
im wanting to go down this path for the 1200 wagon, bluebird h190 with alloy centre to shed some weight compared to the r31 diff i have now
but from looking at the 1500 diff it seemed easier to start with a bluebird diff and cut it down compared to making a ute diff work with 4 stud
but i also couldnt work with the increased track in a 1200 as the guards arent as forgiving as in a 120y
they are however a good "bolt in" diff if you dont mind the track increase and 6 stud
Aware of the issues with the bluebird axles/bearings, but until I have a set with the diff it's hard to know 100% the best course of action. I may retain the standard axles and just re-stud them, although again until I have everything together to make sense of it all I'm just guessing.
Curently my plan is to get some BB axles, suss them out and if they aren't something I can adapt fairly easily then I will turn down the centre of the 720 axle flange and restud it to 4x114.3, and run four-stud brakes (probably 910).
More pics when I piece stuff togehter :)
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