And I just sold Vern's fully set up, front and rear tojo converted rover housings:D
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It has been reported several times that the ARB is quicker to unlock in the front. Makes sense when the ARB is spring loaded and needs air pressure to stay engaged, whereas the MD has a detent to keep it locked, and won't unlock until air pressure is supplied. The MD also has a much greater depth of engagement.
You are correct - it is very difficult to modify the rover centre to accept a toyota 8" crownwheel.
Ah hah. Live & learn.
Regards
Max P