I have a 84 GMC 3/4 ton, 5.0 liter engine.

You will need line wrenches to remove the lines, this is a boxed end wrench with a slot in it, most common are 1/2 and 9/16 inch wrenches you will need them to get the lines loose if you use a standard open ended wrench you will round the corners off. Some came with an adapter fitting and you will need one for backup and one to loosen, they are different sizes so you don't get the lines mixed up. When removing the lines you will need to remove the bolts that hold them in place some have a metal strap that you will need to remove. Remove them one at a time; if you are replacing the lines make sure you look to see if there is any cracks in the radiator around the transmission cooler. Put a pan under the lines at the radiator before loosening the lines because you will lose some oil out of the transmission oil cooler. Some radiators come with a welded on nut be sure if there is one that you hold a wrench on it so that you don't break the radiator. If you buy a straight line you will need a tubing bender to bend the lines to fit. Make sure when you bend the lines you bend it at the same angles, If you buy line wrenches buy craftsman or go To a Napa parts store to buy them. A good wrench is worth its weight in gold to save you from rounding off the nuts.

Aside from some wrench's you will need to be able to bend the line. If you don't have or can't borrow a tubing bender, I've had good luck using a large bolt with two flat washers. Clamp the bolt in a vise, set the line between the washers and snug up the nut so the line just moves. Bend the line slowly and it won;t collapse. Keep your hands close to where you want the bend to be.It's the same as steel brake line, just make sure that when you get a new line at the parts store that the fittings will work on your trans or you will need a double flare kit to change the fittings. Take the old line with you, and they should be able to use fittings there to get you set up. Hope this helps.