Its the G56 manual trans. They are suspect to the aluminum case softening from heat, that will cause misalignment in the gears. There is even a metal girdle that you can buy bolt to the G56 to keep it from flexing, although I wouldn't waist my money on it.
I've never heard of not being able to run a pump/heat exchanger on a manual trans, in fact Ford had a cooling system for one of their manual trans. Mine works great, it helps alot in keeping it cool. It is not set up to run automaticaly, if the temps go over a certain point, I just keep an eye on the temps and flip a switch, when it gets near the 190/200* temperature. I sometimes run it to the coolest point prior to a long climb up a grade, to start the climb at a lower temperature. There is a flaw in my design that I didn't account for, high temperature from high boost pressure coming off the intercooler effects the trans heat exchanger between the radiator and the intercooler. All I need is to install the BD heat exchanger, that I can locate anywhere I want, to eliminate that flaw. If you want to know the specifics, you can PM me.
I've never heard of not being able to run a pump/heat exchanger on a manual trans, in fact Ford had a cooling system for one of their manual trans. Mine works great, it helps alot in keeping it cool. It is not set up to run automaticaly, if the temps go over a certain point, I just keep an eye on the temps and flip a switch, when it gets near the 190/200* temperature. I sometimes run it to the coolest point prior to a long climb up a grade, to start the climb at a lower temperature. There is a flaw in my design that I didn't account for, high temperature from high boost pressure coming off the intercooler effects the trans heat exchanger between the radiator and the intercooler. All I need is to install the BD heat exchanger, that I can locate anywhere I want, to eliminate that flaw. If you want to know the specifics, you can PM me.