I have a popping noise some where in the rear end. It mite be the rear end pinon on 2005 Cadillac Escalade EXT

It only makes this noise when driving not in park. this is a sporadic type of noise and some times this will be 3 to 4 times in a row.

Asked by for the 2005 Cadillac Escalade EXT
1 answer
It could be something simple like a U joint. Even if the joint is not loose, a lack of lubrication inside the joint can cause some nasty noises. The U joint is usually a sealed part from the factory and cannot be lubed. Removal of the driveshaft and inspection of the U joint can usually determine if the joint is bad.