Radical angles and single-cross U-joints do not work well together. The parts will get into a severe bind at certain points, and something has to move, or break. If you're willing to go to a 2-cross U joint called a "constant velocity" unit the binding can be avoided, but the shaft will need to be supported on the upper side of the joint above the steering gear by some sort of bracket or pillow block. If the steering gear is moving as the shaft turns, there's an extreme amount of stress involved, enough to flex the frame. That's also probably the source of your leak. Time to re-engineer things!
Search Ebay for "steering universal joint" for examples of the double-flex joint I'm talking about. There are several listed there, with a very wide spread of prices.
Jerry
