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Rear end problems

Discussion in 'Wrangler YJ (1986-1995)' started by 93 heep, Jan 25, 2018.

  1. Jan 25, 2018 at 1:11 PM
    #1
    93 heep

    93 heep [OP] New Member

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    93 yj hardtop, work in progress
    33 tires, smittybuilt rear bumper w/tire carrier, New 6 cy engine, new transfer case, winch,light bar and windsheild lights
    93yj Having problems at rear end. New engine,New transfer. When driving read differental makes roaring noise, put clutch in noise stops, when let off gas and still in gear while traveling makes roar noise. New u-joints. When accelarating no roar. Is rear end going out?
     
  2. Jan 25, 2018 at 1:32 PM
    #2
    Prerunner1982

    Prerunner1982 Well-Known Member

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    Allen,

    First of all Welcome to Jeeps.net.
    Secondly I would agree that it does sound like the rear differential is on it's way out but I will let the more knowledge members chime in.
    They should stop by soon.
     
  3. Jan 25, 2018 at 6:37 PM
    #3
    JKBob 25

    JKBob 25 Well-Known Member

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    Yeah.....I'm not one of those members. But you came to the right place.

    But welcome to the forum 93 heep.
     
  4. Jan 26, 2018 at 6:56 AM
    #4
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine Moderator

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    Welcome! Is the fluid level correct, and filled with the proper fluid?
     
    JKBob 25 likes this.
  5. Jan 26, 2018 at 7:39 AM
    #5
    OFFGRID

    OFFGRID Well-Known Member

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    Houston
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    1979 Jeep CJ7, 258, TH350, NP208
    Howell fuel injection, header, HEI distributor, TH350, NP208, SOA lift with YJ springs in the front & GW springs in the Rear. AMC20 with G2 1 piece chromos trussed, Dana 30 with G2 chromos and 760x ujoints and MM Stainless Hubs, Geared 4.56. Tom Woods shafts, Metal cloaks, Caged, 37" Toyo MTs.
    This is a hard diagnosis without actually being there. Are you sure it is coming from the rear end. You say a roar? Is it a high pitch squeal like a bearing or a mid pitch wine like the gears not meshing or maybe dry. Have you checked the fluid level in the rear diff. Do you see oil dripping or have you noticed it dripping, it could just be dry. If you are dry it can roar. If you have enough oil and it is roaring i would guess the pinion bearing has gone out. Right now it is a jeep fix, but if you chip a ring gear it becomes a bigger fix. I would guess that seals and bearings on the rearend should cost you around $500 at a shop. This is all considering that it is the rearend. I would like to here some others chime in on this one.
     
    DustStorm4x4 and JKBob 25 like this.
  6. Jan 26, 2018 at 8:39 PM
    #6
    2oldjeeps

    2oldjeeps Well-Known Member

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    98 lifted, 00 stock 99wj just beautiful
    if you have real trouble , a junk yard swap may be cheap and easier
     
    JKBob 25 likes this.
  7. Jan 29, 2018 at 12:58 PM
    #7
    Southeast Overland

    Southeast Overland Well-Known Member

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    Check all your Ujoints in the rear and front shaft, I fought my YJ making the same sound and it turned out to be the axle side U-Joint on the shaft. Would only make noise under throttle.

    ~Jeff
     
  8. Aug 20, 2018 at 12:19 PM
    #8
    Mxdad777

    Mxdad777 Member

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    Pull of your rear pumpkin cover and take a visual inspection. Look for any metal shavings in the oil or any chipped or worn teeth. Even if everything looks great, at least you know now and you're probably due for a fluid change anyway.
     
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