Be very careful when selecting Ball joints for your P-30 chassis. I have had two ball joint failures because a shop installed the wrong ball joints twice. One was at 60 mpg around a corner when the front end just collapsed and the MH almost rolled over. You probably won't find the correct OEM part number so you will look for the after market ones. Does you MH have disc brakes or drum brakes in the rear? The larger heavier P-30's had disc brakes the shorter lighter one had drum breaks. The ball joints are much different. If you have disc brakes on the rear of your P-30 chassis the part number you need is Moog K6511 for the lowers and K6174 for the uppers. Stay away from the Dorman ball joints they are all for the lighter chassis with drum breaks on the rear even though they say HD they are under size on the taper, this is what my shop at home installed and after about 5000 miles they work hardened from being loose in the taper and just failed. Henderson sells these ball joints. Also check your A arms for cracking. That is a whole other discussion. Good Luck.
