User Tag List

Page 1 of 2 12 LastLast
Results 1 to 10 of 11

Thread: Fixing Death Wobble

  1. #1
    Senior Member HillBillE's Avatar
    Join Date
    Jan 2008
    Location
    Duluth, MN
    Posts
    13,921

    Branch
    Army
    Status
    Served
    Served
    1985 to 1998

    Closest Installation

    Fort McCoy
    Mentioned
    66 Post(s)
    Tagged
    0 Thread(s)

    Default Fixing Death Wobble

    Here's some good info on finding and fixing Death Wobble.

    Curing death wobble is defiantly a reality. Death wobble isnít similar to a wobble from an unbalanced tire. It is by far worse. When death wobble hits you will knowÖ itís a violent shake form the front end that feels like the Jeep is about to fall apart. Usually when it happens the only thing you can do to stop it is slow down. The first steps to eliminate death wobble should be a visual inspection of each component, check the bushings, tire balance and an alignment. There are some common things you must check anytime you lift your Jeep. Death wobble is experienced mostly on lifter Jeeps, however it is not uncommon for someone without a lift to experience the dreaded DW. Listed below are a few things you can check.

    Torque specs:

    Item ........................................ Ft. lbs. ................... Nm

    Lug nuts (1/2 X 20 w/ 60* cone) .... 85-115 .............. 115-150
    All tie rod ends ............................ 55 ..................... 74
    Steering (both ends) .................... 55 ..................... 74
    Shock absorber upper nut .............. 16 ..................... 22
    Shock absorber lower nuts ............. 17 ..................... 23
    UCA frame end ............................. 66 ..................... 89
    UCA axle end ............................... 55 ...................... 74
    LCA frame end ............................. 85 ...................... 115
    LCA axle end ............................... 85 ...................... 115
    Track bar frame end ..................... 60 ...................... 81
    Track bar axle end ....................... 40 ....................... 54
    Track bar bracket bolts ................. 92 ....................... 125
    Track bar bracket nut ................... 74 ....................... 100
    Track bar bracket support bolts ...... 31 ....................... 42
    Hub bolts (3) ............................... 75 ....................... 102
    Hub- axle bolt .............................. 175 ..................... 237

    Alingment specs (stock):

    Angle ............. Preferred ........... Range ............. Max R/L diff.

    Caster ............ +7.0* ........ +5.25* to +8.5* ......... 1.25*
    Camber ........... -0.25* ....... -0.75* to +0.5 ........... 1.0*
    Total Toe-in .... +0.25* ....... 0* to +0.45* ............. .05*
    Thrust angle .... 0* to Ī 0.15*



    Check your Track Bar, play in this can cause the axle to shake.
    1. Bushings - check to see that they are not worn. Looks for cracks, and excessive play)
    2. Angles - this angle should be the same as your draglink. Use an angle finders you can get at sears to determine this, donít just eye-ball it.
    3. Bolts Ė Make sure all bolts are tightened down to spec (some lift components have a different torque spec then)

    Check the Axle, your mounts may be worn
    1. Check the axle mount. Here is a good write up on a wallowed out bolt hole
    http://www.jeepin.com/features/trackbarfix/index.asp
    2. Check your Universal joints, a binding or lose U-Joint can cause DW
    3. On the frame end if you still use the conventional Tie Rod End or (TRE) make sure that there is no play in this, as play can cause DW.
    4. Look/Check for worn/torn boots on ball joints/tie-rod ends.

    Check your Tires
    1. Out of balance tires can cause shaking in the front end, which can lead to death wobble.
    2. Make sure all of your lug nuts are tight, (Sounds elementary but it happens to the best of us)

    Check your Frame
    1. Small cracks in the frame can cause the steering box to feel loose, Shaking from DW can only make this worse. 33ís and larger should have some form of Steering box brace, or frame brace in.
    2. If you have upgraded your frame mount, make sure its cranked down nice and tight. (best to use an impact gun)
    3. A busted Frame Mount can cause play in the front end causing DW (Keep a watchful eye on the welds as welds in sheer can break over time.

    Make sure you have a good alignment
    1. After you get an alignment done, have them print out the numbers for you. An XJ should have a 7* positive caster angle. A lifted XJ canít always have that high of a number because the pinion would become out of alignment with the front driveshaft. Pinion angle takes precedence over caster.
    2. Make you sure you go to a place that will adjust the caster if necessary (either by shims in the frame side of the LCAs, or adjustable LCAs).

    The more adjustable parts the easier it is to tune in your suspension.
    1. Adjustable Track Bar
    2. Adjustable Upper and Lower Control Arms (upper ones above 4Ē of lift). Not only are they adjustable, but they are stronger.


    Things to remember:
    1. After any lift, get your Jeep professionally aligned, this is a REQUIREMENT, not a suggestion.
    2. A Steering Stabilizer (SS) is not a quick fix for DW.
    3. Make sure that the lift you purchase comes with all the required parts for a safe driving vehicle. (as long as its going to be a DD)
    4. PLEASE ALWAYS DRIVE WITH YOUR FRONT SWAY BAR CONNECTED!

    Entire list of everything that can cause death wobble:
    -Front tires out of balance
    -Front alignment out of spec
    -Loose track bar
    -Worn track bar bushings
    -Worn track bar end
    -Need adjustable track bar
    -Bad bushings/joints in control arms
    -Worn/damaged steering stabilizer
    -Worn/damaged shocks
    -Worn/damaged tie rod end
    -Bad U Joint
    -Bad ball joint
    -Loose frame mount
    -Steering box looseness
    -Need drop pitman arm
    -Driveshaft(s) not balanced
    -Bad front hub assembly


    As long as the people remain armed,
    government knows that it cannot rule over the people by force.
    Those who stand in defiance of unconstitutional laws
    do so out of duty, honor, oath and love of country.


    "Certified Jeep Junky!"


  2. #2
    Wheelin requires wrenchin Doppler's Avatar
    Join Date
    Jan 2010
    Location
    Newcastle
    Posts
    2,695

    Branch
    Air Force
    Status
    Retired
    Served
    1990 to 2010

    Closest Installation

    Tinker AFB
    Mentioned
    9 Post(s)
    Tagged
    0 Thread(s)

    Default

    Great write up and good timing, I was actually looking for this type of information today.

  3. #3
    Senior Member HillBillE's Avatar
    Join Date
    Jan 2008
    Location
    Duluth, MN
    Posts
    13,921

    Branch
    Army
    Status
    Served
    Served
    1985 to 1998

    Closest Installation

    Fort McCoy
    Mentioned
    66 Post(s)
    Tagged
    0 Thread(s)

    Default

    Quote Originally Posted by Big Daddy View Post
    Great write up and good timing, I was actually looking for this type of information today.
    Thanks, but I can't take credit for the write up

    I 'stole it' of the MN-Jeep forums

    Figured it was good info, and I wanted it where I could find it easy!


    As long as the people remain armed,
    government knows that it cannot rule over the people by force.
    Those who stand in defiance of unconstitutional laws
    do so out of duty, honor, oath and love of country.


    "Certified Jeep Junky!"


  4. #4
    Wheelin requires wrenchin Doppler's Avatar
    Join Date
    Jan 2010
    Location
    Newcastle
    Posts
    2,695

    Branch
    Air Force
    Status
    Retired
    Served
    1990 to 2010

    Closest Installation

    Tinker AFB
    Mentioned
    9 Post(s)
    Tagged
    0 Thread(s)

    Default

    Quote Originally Posted by HillBillE View Post
    Thanks, but I can't take credit for the write up

    I 'stole it' of the MN-Jeep forums

    Figured it was good info, and I wanted it where I could find it easy!
    I copied it to a word document so I could print it and take to the garage with me.

  5. #5
    Wheelin requires wrenchin Doppler's Avatar
    Join Date
    Jan 2010
    Location
    Newcastle
    Posts
    2,695

    Branch
    Air Force
    Status
    Retired
    Served
    1990 to 2010

    Closest Installation

    Tinker AFB
    Mentioned
    9 Post(s)
    Tagged
    0 Thread(s)

    Default

    PM sent

  6. #6
    Senior Member HillBillE's Avatar
    Join Date
    Jan 2008
    Location
    Duluth, MN
    Posts
    13,921

    Branch
    Army
    Status
    Served
    Served
    1985 to 1998

    Closest Installation

    Fort McCoy
    Mentioned
    66 Post(s)
    Tagged
    0 Thread(s)

    Default

    Quote Originally Posted by Big Daddy View Post
    I copied it to a word document so I could print it and take to the garage with me.
    Good idea. I have a 3 ring binder in the shop, I'll be adding this to the other stuff I print off the web.


    As long as the people remain armed,
    government knows that it cannot rule over the people by force.
    Those who stand in defiance of unconstitutional laws
    do so out of duty, honor, oath and love of country.


    "Certified Jeep Junky!"


  7. #7
    faster mabricator
    Join Date
    Feb 2008
    Location
    Barnum
    Posts
    42

    Branch
    Army National Guard
    Status
    Serving
    Served
    2000 to Present

    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default

    Quote Originally Posted by HillBillE View Post
    Thanks, but I can't take credit for the write up

    I 'stole it' of the MN-Jeep forums

    Figured it was good info, and I wanted it where I could find it easy!

    Where it was, I believe, stolen from either NAXJA or JeepForums. Still, very good info.

  8. #8
    Senior Member HillBillE's Avatar
    Join Date
    Jan 2008
    Location
    Duluth, MN
    Posts
    13,921

    Branch
    Army
    Status
    Served
    Served
    1985 to 1998

    Closest Installation

    Fort McCoy
    Mentioned
    66 Post(s)
    Tagged
    0 Thread(s)

    Default

    Bump for relavence.


    As long as the people remain armed,
    government knows that it cannot rule over the people by force.
    Those who stand in defiance of unconstitutional laws
    do so out of duty, honor, oath and love of country.


    "Certified Jeep Junky!"


  9. #9
    Senior Member HillBillE's Avatar
    Join Date
    Jan 2008
    Location
    Duluth, MN
    Posts
    13,921

    Branch
    Army
    Status
    Served
    Served
    1985 to 1998

    Closest Installation

    Fort McCoy
    Mentioned
    66 Post(s)
    Tagged
    0 Thread(s)

    Default

    Quote Originally Posted by HillBillE View Post
    Bump for relavence.
    Bump again!


    As long as the people remain armed,
    government knows that it cannot rule over the people by force.
    Those who stand in defiance of unconstitutional laws
    do so out of duty, honor, oath and love of country.


    "Certified Jeep Junky!"


  10. #10
    Junior Member Combatcop190's Avatar
    Join Date
    Nov 2010
    Location
    Ft. Leavenworth
    Posts
    206

    Branch
    Army
    Status
    Serving
    Served
    1993 to Present

    Closest Installation

    Fort Leavenworth
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Default

    For those of you that have experienced and corrected DW, I have a question. I have experienced two occurrences of DW, both at ~40 mph. this afternoon a buddy and I inspected the steering linkages for wear or something that was loose. What we found was some play in the steering box at the pitman arm. It looks like a bushing in the output shaft is worn. What are the chances this is the problem. I've noticed the play for a while now and it makes alignment tough. When driving straight the steering wheel position changes depending on the wind direction. Somedays the steering wheel is straight others it's canted to the drivers side. Ball joints, track bar, stabilizer, and shocks have all been replaced in the past few months too. I also have a drop pitman arm installed. The only issue I see is the steering box wiggle.
    Dale
    (573) 528-1089

Page 1 of 2 12 LastLast

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Get the MJ Supporter Membership for a little less than $0.06 a day and get more space, 2 MJ Stickers and no banners ads. [Check it out]