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Need help: jeep yj shakes ag 35mph

Discussion in 'Wrangler YJ (1986-1995)' started by Apacker89, Jun 25, 2017.

  1. Jun 25, 2017 at 2:00 PM
    #1
    Apacker89

    Apacker89 [OP] New Member

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    I have a 93 Yj (manual trans) that currently is giving me an issue. At 30mph I get a shake with acceleration. I replaced wires and have new plugs. Also recently replaced the fuel filter. In neutral the shake is not present. The idle is normal and I have no issues until I get above 30mph durring acceleration. Where should I start?
     
  2. Jun 25, 2017 at 6:19 PM
    #2
    JKBob 25

    JKBob 25 Well-Known Member

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    Welcome to the Forum. :jeepwave: I'm sure will be able to help.
     
  3. Jun 26, 2017 at 9:16 AM
    #3
    OFFGRID

    OFFGRID Well-Known Member

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    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.
    Since it doesn't happen in neutral. Good it be a driveline issue, maybe a drive shaft. Have you recently made any changes.
     
  4. Jun 26, 2017 at 9:22 AM
    #4
    Apacker89

    Apacker89 [OP] New Member

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    Besides the tune up I mentioned nothing has been done to the jeep besides breaks a few months ago.
     
  5. Jun 26, 2017 at 9:16 PM
    #5
    aggrex

    aggrex Well-Known Member

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    DE
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    Tuffy>AEV>TTO>JW>STech>EVOcage>MagnaFlow>SpiderTrax>RockHard>TF>SpringTail>67design>Bolt>GPCA>Curt>
    Since you mentioned the brakes in post #2, are the rotors warped? calipers frozen? brake pads? lugs tightened?
     
  6. Jun 26, 2017 at 9:20 PM
    #6
    Apacker89

    Apacker89 [OP] New Member

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    I've gone through them all seem to be fine. I went over them all the other day and nothing was out of place. Could a bad u joint cause a vibration like this? I'm not too familiar with this. I try to fix what I can,but I have never dealt with u joints before.
     
  7. Jun 27, 2017 at 8:41 PM
    #7
    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.
    do you only feel it in acceleration? When did this start? How much lift do you have?
     
  8. Jun 27, 2017 at 8:45 PM
    #8
    Apacker89

    Apacker89 [OP] New Member

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    It is stock, so no lift, and durring acceleration only(above 30mph).
     
  9. Jun 27, 2017 at 9:32 PM
    #9
    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.
    It could be that your drive shafts need new U-joints. I'm just shooting in the wind here. My idea of a failed U-joint is a broken one. They are $10 each for the non-greaseable sealed ones at Oreilly's. A Jeep weed out and only takes an hour or so to change out.
     
  10. Jul 7, 2017 at 10:30 AM
    #10
    Smoke Doc

    Smoke Doc New Member

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    My 91 started a bad shack at 40mph turned out lost a balancing wait off one of the front rims.
     
  11. Jul 10, 2017 at 9:37 PM
    #11
    OFFGRID

    OFFGRID Well-Known Member

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    Houston
    Vehicle:
    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.
    I like the way you are thinking. A bad shake very well could be a weight or a tire that has belts broken and separating on the verge of a blow out. Check the obvious first the tires.
     
    JKBob 25 likes this.
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