John,
I haven't installed a T5 but as Bill stated the Australian Mainline uses the same Chassis as the convertible chassis. A transmission update is high on my want list and plan on either a T5 or an AOD.
The X member could be a deciding factor. Australia uses the same three speed gearbox that the US does I have seen ford-o-matics in some mainlines as well. The three speed uses a complicated linkage that attaches to the bottom of the box to convert it from left to right hand drive. There is a later version of this transmission that has the inspection cover and selectors on the right.
From memory the transmission mounts to the front of the X member with a very short mount.
I don't know how hands on your customer is but I am currently rebuilding a three speed for my ute. As life keeps getting in the way of what I want to do , it may be a few weeks until I get under to replace the munted one that's there. If you require pictures I can drag a camera along.
I'll ask as I was looking at your site not so long ago. Will you be providing your Australian Customer the current or the previous version of your adaptor kit? Right hand drive cars don't need the shifter moved to the left
If it's the previous one I may be interested in one too.
Any information that you can provide to installing the T5 or AOD to a convertible chassis would be helpful to me.
Thanks
Warren
BTW what chassis do the 57 rancheros use?
Grizzly (Aussie Mainline)