Diff & Axle types for mk6 ??

[heehawdafty]

I there
how do i identify what "type" of axle is on my transit?
T280 lwb ratio 5.13 (52 plate)
the etis doesn't specify types ?
and how many different ratios are there for Mk6 single Wheel?
is there a difference between the diff for a twin wheel and a single (crown wheel and pinion?)
Cheers