Looking to replace transmission cooler lines with something better if there is anything. Steel braided inc. I just installed a new all alum 3 row 3 elec fan with shroud radiator assembly and I have a hayden tranny cooler I am planning on putting in line with the radiator. All of this is on a 91 xj. Let me know what suggestions you have. Thanks

Have not heard of steel braided transmission lines, or ' other' material (likely because the system is low pressure and the lines do not participate in moving sections (like brake lines do).
Some replace certain sections of the old 'alloy' line with the 'rubber'/keflar/whatever transmission oil cooler lines, especially where they found their lines being squashed near the front axle due to off-road flex etc. Or around leaking fittings.