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1999 gmc suburban 1500 2wd rear end making loud roaring noise

Discussion in 'GM Powertrain' started by simmre, May 18, 2013.

  1. simmre

    simmre New Member

    hi guys. my name is robert and i'm new to the forum. my problem is the rear end on my 1999 suburban is making a loud roaring sound. i'm thinking the diff is shot. i'm about to take off the cover and check for meteal particles/visible damage etc. is rear end failure common on these trucks? i'm a pretty good mechanic, but i've never rebuilt a diff. so, i'll be scouring the salvage yards looking for a bolt in replacement. aside from low mileage, and particular options, what should i look for as far as picking up a good replacement? in other words, how can i determine if the new diff is damaged before i buy it? thanks for any help that i can get. i'll post back with what i found in my diff.
  2. tbplus10

    tbplus10 Epic Member Staff Member 5+ Years 5000 Posts Platinum Contributor

    Before you condemn the diff check the axle bearings and the pinion bearing.
    With a roaring rear axle Id suspect a bearing issue over bad gears.
  3. zippstripp

    zippstripp Member 1 Year

    Don't let the diff. scare ya. Sure does sound like a pinion bearing, in that case replace all the bearings.
  4. retired2001

    retired2001 Epic Member 5+ Years 5000 Posts

    Welcome to the G M T C ! Good luck with your dif' problems!
  5. MrShorty

    MrShorty Epic Member Staff Member 5+ Years 1000 Posts

    Moved to Powertrain. It does sound like a pinion bearing, but certainly double check other things.
  6. SurrealOne

    SurrealOne Former Member ROTM Winner 1000 Posts

    Welcome, Robert. I can't help with the issue but there's been some good advice, so far, in the thread from gents I've learned to trust over the years.

    Let us know what you find?

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