1999 Other GMC Models V8 Four Wheel Drive Automatic 230000 miles
My 99 GMC Suburban is making a howling sound when I accelerate. I have just changed the ujoint to fix one problem and both front and rear differentials are leaking as well as the transfer case. I know I need to replace the seals, but can not isolate the howling sound. It does get a lot quiter when I stop accelerating.