cidsamuth

Okay, so a few days ago, I asked you guys about replacing the differential and transmission fluids in my wife's 2009 Tahoe with 62k miles. My desire to change them was triggered because the rear diff was leaking from underneath the "pumpkin." Long story short, the Chevy dealer confirmed it is covered under the powertrain warranty. Because my wife couldn't wait 3 hours for the repair that day, she scheduled it for next Monday. In the meantime, the dealer said the diff was not too low in fluid yet, but they topped it off just in case.

Fast forward 4 days to today, the Tahoe is acting crazy. When you put it in drive, it goes fine. But, in reverse, it doesn't want to move -- it acts almost like the brakes are locked up. It's bad enough that you can put in in reverse and let your foot off the brake, and the car won't move. But, again, it goes fine in drive -- and not just a little like we're overcoming brake lock while in drive, instead it goes with no trouble.

When you put it in reverse and give it enough gas to overcome the "locked" feel, the car emits an extremely loud squealing noise as it moves. Louder than any brake squeal I've ever heard.

This has got to be related to the rear diff, wouldn't you think?

hicksvilleshick

yup. something has gone horribly wrong in the diff. I'd get back to the dealership asap.


:chug:

cidsamuth

Got it to the dealership. They report the right parking brake is frozen. He really couldn't say why it only made the noise (and hung up) in reverse and not drive. We shall see . . .

hicksvilleshick

that truck should be able to somewhat easily overpower a hung up brake. neverminding that if it's a hung up brake why does it only work backwards, and not forwards... :dunno: this will be interesting to see.


:chug: