Greetings to all, i have a question about the driveshaft on my '73. currently, i have 2 u-joints on either end of my driveshaft. they are a special type, with a ball and socket connecting each pair, with a housing around both sets. the front set has been replaced at some point, with a greasable unit, and gives me no problems at all. the aft set appears to be original equipment, and has begun to squeak during deceleration. there is no play, and i have greased the offending unit with a hypodermic syringe and some high temp lube, until i can get it changed. when i went to the parts store for a set of u-joints, they gave me a set of plain cross u-joints with no ball and socket. car quest and pep boys are trying to sell me the same parts-no cv joints, just plain u-joints. i can press them in, no problem, but it doesn't seem correct. my question is: will heavy duty, plain u-joints suffice for this application? my instincts as a helicopter mechanic tell me to ask before i try it. thanks in advance dj 2 yellow(tan?)'73's