I will be using this grease to lube my 2500HD pickup chassis and u-joints. I will also use it to lube the farm tractor, bush hog, and case dozer. 238#2, 221#2 or 274#2? I love the 238#2 but is it too heavy for u-joints? I would rather have to keep up with just one grease. Would 221#2 be a better compramise? I like that the 274 is a synthetic blend, but it may be too soft to stay in the dozer for very long.