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Here's a pic of both might help you understand a little better. \

Drop box's
http://i1205.photobucket.com/albums/bb425/blowngq1/dropbox.jpg

Drop arms...

The extended arms are an entirely new item longer than the standard arms. They basically hold your diff steady in place. a dropped box allows to keep the standard arms but relocates them forward to...

Extended brake lines and diff breathers, adjustable panhard rods and drag link, drop boxes or drop arms, possibly adjustable or extended rear control arms.

Tony

I thought this was pretty interesting to read. I'm not a fan of foam & or oiled filters.

http://www.outerlimits4x4.com/viewtopic.php?f=8&t=31483&view=next

Here - a tire calculator:
http://www.tyresave.co.uk/tyresize.html



p.s. AB may be you should make a sticky post only with one (or more) tire calculator to help the forum members.

Here we go http://www.nissanpatrol.com.au/forums/showthread.php?3423-Diff-ratio-tyre-size-speedo-gear-%28pinion%29&highlight=speedo+pinion