FreeTaz said:

Have you still got this project in mind?

At first glance, I see the IRD swap as possible, but it is unlikely to be confined to just the IRD.
To begin with, the IRD casings and internals are different, leading to the possibility that the external dimensions do not match, especially in the output shaft position and/or size.
There are different part numbers for the driveshafts, and from memory the wheel bearings as well, therefore the only way to do it would be to have good samples of each to compare minutely.
This would apply to everything from the input shaft (as well as the L/H output shaft inside the input shaft) right through to wheel bearings and hub splines.

There are probably great results possible for the change in ratio, and it might be of great interest to a lot of Freebie owners out there, but a lot of measuring needs to be done first.

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