In my future plans, I am going to install dual exhaust. The muffler guy told me I will have to move my transmission line that run to the radiator. Has anybody else done this? Where did you reroute them to, and did you bend steel line or use steel braided line.

Is installing a separate transmission cooler like This or This and just cap off the radiator fittings an option?

Usually you can just bend the exsisting metal lines to tuck against the side of the engine so there is room for the second exhaust pipe.

When I use an aftermarket trans cooler I route the flow so it goes through ther radiator cooler first and then thru the aftermarket cooler, then back to the trans.
DD

Your muffler guy is probably just lazy. I've got Dutra Duals, power steering, kickdown and column shift linkage, and my exhaust man got 2" headpipes snaked through the tight opening.

So, it can be done. Would it be easier for him if you rerouted the lines? Yes. But is it necessary? No. And bending new lines SUCKS (ask me how I know...)

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Too many people who were born on third base actually believe they've hit a triple.

If it comes down to actually having to re-do some of it you can cut and flare the existing lines and use a union to add another front section. One thing to keep in mind is that near the front of the engine the lines should be as close to the balancer as is practical. This will help keep the flexing of the lines and torque on the radiator fittings to a minimum. I suppose a combination of steel and hose might work well too. Steel from the radiator, along the inner fender and going to hose under the car alongside the trans. Some cars have just the opposite from the factory, with hose in the front. The hose shops I have dealt with have some lower pressure hydraulic hoses that use crimp fittings but do not have steel braiding. They are less expensive, more flexible and would be up to the task too.