not sure man, you might be right, i think callums car did the same thing on deceleration, but it was weld splatter on the gears and shit inside the diff,
althought i think you could be right im not sure, adjust your rear brakes, so there the same on each side (ie, even if one sides worn more theres the same distance between shoes and drum) and see if it still does it, could be totally rong but at least your handbrake will be nice and firm lol.
other than that, im not sure, check ur diff oil level.
dunno man...
