I replaced both the front and rear control arm bushings up front. I couldn't get a socket and torque wrench on the nut on the back of the rear bushing so I simply torqued it down with a box wrench. I've had some groaning and rattling since, so I checked the nut on the rear of the rear bushing. On the passenger side it was fine, but, on the driver's side, it had loosened some. I tightened it, but it's come loose again. It's nowhere near coming off, but the car has no noise when it's tight. I've rechecked nuts on the front bushings and looked for loose stuff, but I can't find anything else that's loose. Does anyone think this is indicative of a problem or should I grease the rear face of the nut and put some loctite on the threads?