Mine was (actually is) metal hard lines out of the trans, to about 18" or so away from b&m super cooler, formed a bubble at the end of each line to create a barb, hose clamped reinforced rubber trans cooler hose, to NPT barb fittings on the cooler, clamped there too. I never had any problems with it. The few tech people that wanted the hood open were all fixated on the fuel lines and the battery which was never moved to the back.

It's been fine since around 2002/2004 or whatever year it was I did it, but looks like I will have a chance to do it again soon b/c of the rebuild, and will come up with a better arrangement.