sence tranny fluid passes through the radiator with an auto,
would i need a m6 tranny if i was gonna do the swap?

 

If you are swapping from an auto to a manual, no. You can just leave the fittings loose.

 

I know you can leave the auto rad. in there,but does the manual rad. have more cooling do to it not having the passing of trans fluid?

 

ok, so i would not need it for the swap.

 

The cooling tubes take up a very small amount of space inside the RH tank of the radiator. Not enough to worry about.

 

yep, but if I were you I'd get a couple pipe pligs and close off the ports, to keep water/corrision from getting in. Wont even cost ya a dollar, and you'll be glag you did if you ever put an auto in there or sell the radiator.