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rumble from the rear....help
couple weeks ago i heard a rumble sound coming from the rear, when travelling at low speeds 5-10mph it rumbles and then as you speed up it goes and there is a slight whine. first i was thinkning wheel bearing but after having the car jacked up at the rear i spun the drivers side rear wheel and it spun no worries but when i tried the near side rear wheel it was hard to spin to the point where you really have to force the wheel to turn so a seized piston came into my head so took the wheel off and un done the caliper bolts and tried to get the caliper off and it wouldnt budge and the only way i got it off was with a hammer. would a seized piston cause this rumbling sound as i cant tell, i so dont want it to be a rear diff but how can i tell if the diff is on its way out, the rear diff has a slight leak from the seal so i shall i get some diff oil to top it up but the question's im asking is would a seized piston in the rear caliper make a rumbling sound or would it be the diff making that noise??