Difference in 3 speed manual transmissions Truck/car ?????

not worth it
There has to be a slip yoke somewhere between the trans and the rear end, to compensate for the changing distance between the yokes, as the rear suspension cycles.
What you get with that free trans is the headache of re-engineering your driveshaft. Plus you will need a longer one to start with.

Having said that;
You can convert that pictured trans to what you need, with the right parts.