Re: commodore t5 in fords?
there are so many versions of the T5 it isn't funny.
If you want to swap the whole box then you have a chance!
First thing you need is box lengths
A. From front face of housing to end of mainshaft
B. From front face of imput shaft to end of mainshaft
The spline on the input shaft however is the same.
On the falcons, there is a difference between 6 and 8 cylinder boxes in measurment B....exactly 20 mm ( iam unsure if this rings true for holdens)
If you can match up the measurements then the next port of call is spigot bearing size, then mount position on the extension housing.
My experience has shown that holden T5 installations are typically close ratio's and the fords are wide ratios.
IT is plausible, and if they measure up it can be done. If you do a lot of towing, then i would be searching for a box fitted to and ford commercial, as they have a low first and reverse.