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Technical LH thread wheel nuts

Discussion in 'The Hokey Ass Message Board' started by keith27T, May 29, 2020.

  1. KenC
    Joined: Sep 14, 2006
    Posts: 1,045

    KenC
    Member

    Someone mentioned mopar sizes. Big cars were 1/2, small cars 7/16 in most years. LH on left side only
     
  2. Paul
    Joined: Aug 29, 2002
    Posts: 16,386

    Paul
    Editor

    I bought mine at NAPA
    1/2" 20 L to fit the '63 Pontiac rear in my current project.
    I will knock the studs out and replace with RH studs before it hits the road, seems kinda dumb to have left hand threads on only one wheel..

    IMG_20200530_065939.jpg
     
    Hnstray likes this.
  3. You can tell by the part number that they are Dorman.


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  4. squirrel
    Joined: Sep 23, 2004
    Posts: 55,934

    squirrel
    Member

    dorman number for those nuts is 611-026. How do you tell that 641-2025 a dorman part? Just curious.
     
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  5. Well at least in Canada.... many dorman parts cross into Napa numbers. Always three digits, a dash and four digits. Here Napa puts their own number and logo on them.


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  6. lippy
    Joined: Sep 27, 2006
    Posts: 6,825

    lippy
    Member
    from Ks

    No biggie, all from Taiwan anyway. lol.
     
  7. Here’s a pic guy’s IMG_2907.JPG


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  8. Dorman Nuts start 611- and studs start 610-
    Went to Dorman site and....


    dorman.png
     
  9. I would just change the studs, really not that big a deal
     
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  10. The front is


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  11. 302GMC
    Joined: Dec 15, 2005
    Posts: 7,856

    302GMC
    Member
    from Idaho

    Need a pic from the side of the stud ..
     
  12. KenC
    Joined: Sep 14, 2006
    Posts: 1,045

    KenC
    Member

    The studs are listed in Dorman site by 38 chev master app. Posted earlier but was in an edited post
     




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  14. IMG_2886.JPG


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  15. jaracer
    Joined: Oct 4, 2008
    Posts: 2,419

    jaracer
    Member

    When I worked at the Dodge dealership, guys uses to come in with 5 broken studs with the nuts still attached and the letter L quite visible on the end of the stud.
     
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  16. 49ratfink
    Joined: Feb 8, 2004
    Posts: 18,828

    49ratfink
    Member
    from California

    82 year old studs should all be replaced anyways. I'd swap them all out for regular studs.
     
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  17. I don’t fix what ain’t broken. Lol


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  18. Ericnova72
    Joined: May 1, 2007
    Posts: 595

    Ericnova72
    Member
    from Michigan

    I had a '73 Plymouth duster in high school, it had the left hand lugs on the drivers side....my Dad made a special point of making sure I knew that. Had them up to '76, maybe later IDK on the Chrysler A- body....might have ended when the Aspens replaced the Duster/Valiant/Swinger
     
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  19. BJR
    Joined: Mar 11, 2005
    Posts: 9,814

    BJR
    Member

    Buicks Olds and Cadillac had left hand threads on the drivers side. So does my 52 Willys CJ3A Jeep.
     
  20. blowby
    Joined: Dec 27, 2012
    Posts: 8,661

    blowby
    Member
    from Nicasio Ca

    So, is it a failed concept, this left hand thing? I was putting the front wheels on my Chevy (rh thread) a few years ago. I got distracted, came out later, dropped it off the jack and drove off with the lug nuts hand tight. The driver's side wheel came off a couple miles later (passed me, went through a blackberry hedge and landed in a swamp). Wonder if left hand threads would have made a difference.
     
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  21. Poncho60
    Joined: Jan 23, 2011
    Posts: 278

    Poncho60
    Member
    from N Illinois

    The original concept of the LH & RH thds was that they would be self tightening with the normal rotation of the wheels when driving down the road. Not tight tight but would keep them from coming off. They finally determined it really wasn't an issue if they were all RH as long as they were properly tightened. Even the Pontiac 8 lug aluminum hub and drum setup had LH thds up thru 63. Chgd to all RH in 64.
     
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  22. squirrel
    Joined: Sep 23, 2004
    Posts: 55,934

    squirrel
    Member

    I hear just as many stories about guys not knowing they're LH and screwing things up, as I do about wheels falling off the left side of the car because they were loose. Using all RH keeps the part number count down.

    56 plymouth is a good one...studs front, bolts on the rear, and they are LH and RH. So each wheel uses a different fastener!
     
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  23. jimgoetz
    Joined: Sep 6, 2013
    Posts: 517

    jimgoetz
    Member

    I had a 56 Plymouth in about 1966 and yes now I remember the rear wheels having bolts. It never hit me before that all 4 wheels had their own fasteners.
     
  24. STRICK9
    Joined: May 18, 2020
    Posts: 6

    STRICK9

    My 59 Olds has left hand nuts on the left side and right hand nuts on the right side


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  25. Nuts to you all :):)
     
  26. No really thanks for the help! I going to go to a napa to see if I can get a single and try it out.
     
  27. I remember doing a brake job on a Chrysler. left hand nuts on the right front, left hand nuts on the left rear. the last guy put the front hubs on the wrong side.
     
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  28. 302GMC
    Joined: Dec 15, 2005
    Posts: 7,856

    302GMC
    Member
    from Idaho

    Keith, I'll never doubt you again … makes you wonder who would do such a thing.
     
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  29. Mr48chev
    Joined: Dec 28, 2007
    Posts: 33,861

    Mr48chev
    ALLIANCE MEMBER

    I saw that at least once back in my Firestone days. Still had my old impact wrench that didn't have much power so when it stalled out I started checking.
     
  30. Dick Stevens
    Joined: Aug 7, 2012
    Posts: 3,710

    Dick Stevens
    Member

    Don't to be so quick to thank him as he is wrong!
     

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