1987 subaru gl 1.8 4 wheel drive.Making clunking and popping noises in front end.Took it to mechanic who said axle shaft going into differential is real loose and causing the noise.He is not a transmission man he said and does not know how to fix it.I need your help! What is wrong and how to fix it.Need car to get to work.Both front cv axle shafts have been replaced. It is the transmission stub that is real loose.