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  1. #1
    Join Date
    May 2013
    jacksonville, florida

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

    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. #2


    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. #3
    Jr. Mechanic
    Join Date
    Apr 2013
    East Central Iowa


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

  4. #4


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

    2010 Z/71 Colorado C/C
    Black 4X4 w/5.3L V8
    2007 Winnebago Adventurer
    w/8.1L Chevy & Allison 6spd.
    Canyon Lake, Texas

  5. #5


    Moved to Powertrain. It does sound like a pinion bearing, but certainly double check other things.
    '98 K1500 Suburban LS 5.7 L 4L60E NV246 ARB
    '92 Ford Explorer XLT 4x4 4.0 L A4LD BW13-54 Trac-loc rear
    "My toys were the greasy cogs and springs and pistons that lay around all over the place, and these, I can promise you, were far more fun to play with than most of the plastic rubbish children are given nowadays." Danny in Roald Dahl's Danny The Champion of the World

  6. #6


    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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