I wrote this and I don't think its too clear after
re-reading:

<< If it might be a used box your after then
 get one that will give you the least amount of hassle
 on installing it. >>

Let's try this instead:

If its a used gearbox you need then get an indentical
one to the unit that you wish to replace.  That way
you eliminate most of the hassle factor.

Hope that was better!
~~~~~~~~~~~~~~~~~~~~~~~~~~~
Todd Hill
VolksWerks Transaxles
Olympia, WA