Topic: TH400 cooler line threads?
I'm putting lines in the trans and from what I read, they have a 1/4-18 NPSM thread into them. I ordered the fittings from Jegs and they are too big to screw in. I was also told not to use pipe threads as they fit, but the taper can crack the case. I'm not sure what year the trans is offhand. What other threads could they be? 3/8"?