i have a vt and it seems to have slack in the tailshaf diff or box somewhere along the driveline someimes ill turn a corner and it will make a lound metal clunk sound sounds like its right at the back it only happens verry rarely but want o fix it in case it happens at a time that im up it and something breaks also when you put i in park on the slightest of hills it will roll abou 2 foot forward before the gear actually stops it any idea where i could start looking to find the problem