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Technical 1937 Chevy Sedan Death Wobble (Help!)

Discussion in 'The Hokey Ass Message Board' started by Zac B, Oct 28, 2017.

  1. Zac B
    Joined: Jul 21, 2016
    Posts: 64

    Zac B
    Member
    from Norman, OK

    So, a few weeks ago I was driving to a local car show in my '37 Chevy & after turning onto a bumpy road my steering wheel started shaking like a SOB. I quickly came to a stop and the death wobble went away. I hadn't felt it for a few weeks until this morning when I was driving to a local swap meet here in town and sure enough, I turned onto another bumpy ass road and the death wobble showed up, shook me to death until I came to a complete stop, then disappeared.
    It seems like it is only triggered by rough roads & goes away when I come to a stop. There is some play in the steering at all times. I have all new tires & shocks on the car and drove it the last year or so with no death wobble. I've been doing some research and have seen a laundry list of possible causes. I've attached some pictures I had on my phone of my front end set up for your reference. I plan on taking it to a local front end shop next week, but wanted to get some insight from the forum first.
    Thanks
    IMG_5592.JPG IMG_5593.JPG IMG_5596.JPG IMG_5592.JPG IMG_5593.JPG IMG_5596.JPG IMG_5598.JPG IMG_5600.JPG
     
  2. BJR
    Joined: Mar 11, 2005
    Posts: 9,917

    BJR
    Member

    Warn king pins/bushings, bad bushings in the ends of the springs, bad tie rod ends, you get the picture, fix anything that is loose. You said there was play in the steering, fix it. Check the caster and toe in. Good luck, BJR.
     
    Zac B likes this.
  3. 302GMC
    Joined: Dec 15, 2005
    Posts: 7,877

    302GMC
    Member
    from Idaho

    It looks like big ol' truck tires on there - try it with a different smaller pair ...
    If it's in as good condition as it appears, roll another 3 - 4 degrees caster into it & try it.
    The springs in the drag link & tierod ends tend to metal fatique & break, so check by taking them apart - it's hard to make sure when installed.
     
  4. xlr8
    Joined: Jun 26, 2006
    Posts: 700

    xlr8
    Member
    from Idaho

    Usually that is caused by worn out kingpins and bushings.
     

  5. Sheep Dip
    Joined: Dec 29, 2010
    Posts: 1,572

    Sheep Dip
    Member
    from Central Ca

    Might as well order it all and rebuild like new
     
  6. southcross2631
    Joined: Jan 20, 2013
    Posts: 4,412

    southcross2631
    Member

    King pins and bushings . While your at it add a steering stabilizer.
     
  7. Zac B
    Joined: Jul 21, 2016
    Posts: 64

    Zac B
    Member
    from Norman, OK

    Tires are brand new 6.00x16 bias ply Coker's. Less than 300 miles on them. I'm planning on digging into it a little further in the garage today & see what I can come up with. Thanks for all th advice!

    IMG_4972.JPG
     
    TFoch, Fern 54 and turboroadster like this.
  8. Zippi
    Joined: Nov 27, 2016
    Posts: 156

    Zippi
    Member

    I had this happen on my 37 Ford pickup. It will get your attention really quick. I already had new shocks in front, front tires re-balanced and everything felt really tight. Maybe a little to tight as the front end is really stiff. Running the stock frame and a reverse eye spring in front with disk brakes. My wishbone ball was loose so I replaced the bolts and cotter pins. I also lowered the air pressure in my tires from 32 psi to 30 psi and it gives a little smoother ride. I now try and dodge all the pot holes so I look like a drunk driver on the road. Haven't had it happen in some time now so I don't know if I really helped anything or not.
     
    Last edited: Oct 29, 2017
  9. junkyardjeff
    Joined: Jul 23, 2005
    Posts: 8,596

    junkyardjeff
    Member

    I had that happen only with non or incorrectly balanced bias ply tires even with vehicles that had IFS and never had it happen yet with radials,give the suspension a good look over and maybe have the balance on the front tires rechecked.
     
  10. Joe H
    Joined: Feb 10, 2008
    Posts: 1,550

    Joe H
    Member

    You have the same basic front end as my '37 truck does, mine drives great with all rebuilt parts. Start by checking the dragline ends, they are adjustable. Tighten the end caps till they won't turn, then back off one slot and replace the cotter key. Your tie-rod ends appear to be "modern type" with no adjustment. Check the kingpins and wheel bearings for play, then move to the steering gear box. They are simple to adjust and it makes a difference in driving. Look here at section #9 for adjustment procedures 37csnindex.htm

    Joe
     
    302GMC likes this.
  11. While your at it,add new ball joints and drag link to the list. HRP
     
  12. Ball joints?
     
  13. zeph4057k
    Joined: Nov 28, 2011
    Posts: 475

    zeph4057k
    Member

    I think you should get longer rubber brake hoses, those are way to short, for your own safety.
     
  14. dorf
    Joined: Dec 5, 2008
    Posts: 1,087

    dorf
    Member
    from ohio

    check the bolts in your steering box and make sure they are not sheard .
     
    Zac B likes this.
  15. lumpy 63
    Joined: Aug 2, 2010
    Posts: 2,610

    lumpy 63
    Member

    Check steering box adjustment for sure , make sure it has lube in it, I like john deere corn head grease. You can jack up front end just enough to get tires off the ground and grab pass side wheel and rock back and forth while looking for play in tie rod ends , drag link etc. and a steering stabilizer is a good addition. My 37 has an OE steering box with NOS gears and I added the newer style tie rod ends + added some caster to it. No wobbles so far...
     
    Zac B likes this.
  16. Zac B
    Joined: Jul 21, 2016
    Posts: 64

    Zac B
    Member
    from Norman, OK

    Spent a little time tonight tinkering with the steering issue. Looks like it's coming from the play in the steering box. I can turn the wheels all the way one direction and manually create the same wobble I feel during the death wobble and it seems as if it's all coming from that play in the steering box. I've done some reading and it seems as if rock auto will rebuild your steering box to the tune of $235. Anyone done this or have any reccomendations? Not looking to go any route where I have to change a bunch of components or lose my stock banjo steering wheel.
    Thanks
     
  17. southcross2631
    Joined: Jan 20, 2013
    Posts: 4,412

    southcross2631
    Member

    I would be leery of sending my steering box to rock auto. they told me they had a brake booster for a Torino that I was doing . After ordering it, a week later they said they did not have one and couldn't get one. Then had to wait 7 business days to get a refund.
    you may send it and never see it again.
     
  18. ...check the ads in Hemmings Motor News, there's a few companies that rebuild steering boxes,...
     
    Zac B likes this.
  19. Joe H
    Joined: Feb 10, 2008
    Posts: 1,550

    Joe H
    Member

    Kits are available online and the work is pretty straight forward. The hardest part is getting it out of the car.
    Chevrolet_Steering_Gear_Overhaul_Kit_Straight_Axle_Car.html bearing kit

    360494843513 sector shaft

    362037409169 worm gear

    With these three parts, you can have a NOS gear box, which will be way better then what RockAuto could ever build you. If you need help help, let me know, I could give you hand with it. I built a couple using these old NOS parts. I have a rebuilt '37 truck box and a rebuilt '46 truck box in my truck now, both worked like new.
     
    Zac B likes this.
  20. Joe H
    Joined: Feb 10, 2008
    Posts: 1,550

    Joe H
    Member

    282696640606 here is another worm gear, hard to believe you can still find them, it took for ever to find a truck one.
    122736893490 another sector.
     

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