What is wrong with my Blazer

hippychic

It is making a grinding noise on the passenger side in the rear .

Mr_Shiftright

Well best way to deal with that is get it on a lift (one that allows the wheels to spin free) and test run it with someone listening down below. That *might* work although some types of bearing and differential noise need the vehicle to be under "load", that is, actually working, climbing or turning.

Noises transmit easily through the car, so it can be very difficult to locate precisely. But while it's on a lift you can do other things, like examine the differential oil for metal debris, and check the free play in the rear wheels to check for wheel bearing failure.

And sometimes, you just have to let it get worse, if the noise isn't very obvious to the technician.

But a good trained ear should be able to nail this one.

In any event, do it right away. You might otherwise damage something even more.