I have a glanza with a ep82 box, The gearbox whines a lot at low revs maybe on high But cannot hear it because of exhaust sound, The gearbox also jolts back and forth and for example I'm in 3rd gear doing around 60-70miles and I let off accelerator the speed will drop rapidly like I'm braking.. There is oil around the gearbox and the driveshaft inputs, I changed the seals around the box but it still leaks from there. Can the oil be because the diff is moving around a lot? Thanks