>   Is this swap possible?

Sure. If anything, it's easier than going from auto to manual. Just make
sure you get all the parts.

> Surely someone has done this? One of the biggest differences I noticed was
> the automatic was connected to the cooling system. Why is that?
>
>
ATF cooler. Actually, it's technically a cooler/heater, intended to bring
the transmission up to operating temps quickly and then keep it there. Not
really necessary though. Some even consider it a liability, as the exchanger
is made of aluminum and can corrode. More than one transmission has been
ruined by an unexpected pressurized injection of piping hot water based
coolant into the transmission.

I think the real problem with the auto trannies are the design itself. I
have one van of each, manual and auto, and the manual has so much more power
where the wheels hit the road and gets better gas mileage to boot. The auto
transmission is limited by the fact that 1) it's a 3 speed geared low for
wimpy engines, and 2) non-lockup torque converter that steals engine power
and turns it into friction heat in the ATF. My auto van is great for
toodling around town in heavy traffic for work, but on the open highway, I
wouldn't trade the manual in my "fun van" for anything.

--
John Bange