The cooling system consists of more than just the radiator. You mentioned that the old radiator was full of gunk, so you need to 100% replace the cooling system components and chemically flush the block.
Cheap parts are cheap for a reason. If you plan on keeping any vehicle for an extended period of time, use the best quality parts you can afford. However, a decent Jeep radiator doesn't cost $400, more like $125-175.
Progressive Liberalism: Bringing you new ideas so wonderful, they have to include mandatory participation ......
Originally Posted by Ronald W. Reagan: Government is not the solution to our problem; Government is the problem.