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History Chrysler's LH Thread Wheel Studs

Discussion in 'The Hokey Ass Message Board' started by stan55, Nov 14, 2009.

  1. Anyone on here know the history and why they used LH threaded Wheel Studs on the LH side of he vehicle. Has anyone changed these to RH thread without problems? Thanks, I just need a history lesson.
  2. Old61
    Joined: Sep 20, 2008
    Posts: 268

    from PA

    They are easily changed. They were LH so they wouldn't loosen up driving forward.
  3. I thought that was the case, but no other mfg had this, so I will change to RH thread for convenience
  4. jetmek
    Joined: Jan 12, 2006
    Posts: 1,846


    several other makes used them...studebaker for instance also common on trucks

  5. stude 283
    Joined: Oct 22, 2009
    Posts: 5

    stude 283

    1951 pontiac also has lefties on left!
  6. dirty old man
    Joined: Feb 2, 2008
    Posts: 8,792

    dirty old man

    IIRC, Studebaker had this also, and Hudson also, I think. I do know you could take the hubs off, knock out the studs and any parts store that was worth a shit had a Dorman cabinet with new lug bolts and nuts in RH thd. of the correct dimension to change it over.
  7. squirrel
    Joined: Sep 23, 2004
    Posts: 47,426


    I wanna know why the 56 plymouth has studs and nuts up front, and bolts in back. Each wheel has different hardware holding it on
  8. Little Wing
    Joined: Nov 25, 2005
    Posts: 7,501

    Little Wing
    from Northeast

    61 Tempest as well,,and the car had a Sm Ford bolt pattern to boot ,,lol
  9. BigBlockMopar
    Joined: Feb 4, 2006
    Posts: 1,360


    My '57 Plymouth has just bolts holding the wheels.
    Not for long though...
  10. Gotgas
    Joined: Jul 22, 2004
    Posts: 6,916

    from DFW USA

    Most manufacturers except Ford used the L/R threads at some time. The engineering principles are sound, it's just a pain to deal with in the real world.

    Squirrel, I've never heard that before! I've never heard of a Mopar that had mismatched lugs/bolts from the factory. I know my '57 Plymouth had bolts originally and that there are some cases of Plymouths using these through 1959. My '57 Chrysler has lug nuts and I believe Chrysler stopped using lug bolts completely after 1956.

    They were doing some weird chit, that's for sure...
  11. moparmonkey
    Joined: Aug 14, 2009
    Posts: 565

    from NorCal

    Not sure on that one, sickgirl's 55' Dodge Coronet has studs and nuts all around. Axle/rear end swap maybe?
  12. R Pope
    Joined: Jan 23, 2006
    Posts: 3,309

    R Pope

    I've had several Mopars with both studs and bolts.
    Just about every tandem and semi with Budd wheels has left hand thread on the left side. Have you ever lost a wheel? It's almost always the left rear one that comes off. Never seen an old Mopar lose a wheel, lots of Fords and Chevy's,though.
  13. Billa212
    Joined: Mar 23, 2008
    Posts: 159

    from Milwaukee

    Willys and Kaiser Jeeps had LH '50 Chrysler has bolts holding the wheels on
  14. squirrel
    Joined: Sep 23, 2004
    Posts: 47,426


    I had two 56 plymouths, they both had bolts in back and nuts up front. Ever try to find a left hand wheel bolt?
  15. Retro Jim
    Joined: May 27, 2007
    Posts: 3,859

    Retro Jim

    I have a 1937 Plymouth pick up and bolts front and rear .
    I had a 67 Chrysler T&C wagon with disc brakes and both L&R thread .
    Had a 69 Dodge Super Bee with the same L&R hand threads .
    None of the lugs ever came loose either !

  16. 73RR
    Joined: Jan 29, 2007
    Posts: 6,515


    I believe that the LH threads had to do with the machinery used in the assembly plants.
    For those folks who are familiar with old industrial plants using 'lineshafts', you will understand the principle of equipment being turned, mechanically, in one direction. No impact guns in 1909...

    I do not believe there is an engineering principle related to lug nuts, as we know them, loosening while driving or the problem would still be with us and likely be amplified by the speeds that we drive compared to the 'old' days.

  17. i remember snapping off 3 lugs on my 36' plymouth before i was shown the correct way to remove a wheel.
  18. SixFive
    Joined: Aug 19, 2004
    Posts: 183


    Got them on my Chrysler, couldn't really see a reason for it.

    Always made me laugh that some same year GM cars had it and some didn't,
    If you bought a Chevrolet, then all your wheels can fly of and you'll die, but if you paid for a Buick we'll look after you with these speacial left hand threads..
  19. R Pope
    Joined: Jan 23, 2006
    Posts: 3,309

    R Pope

    Never heard the one about the machinery at the plant being the reason. Good story, it just ain't true! I think the factories would have updated by now at places like Navistar, Kenworth, and like that, by now!
    I've seen and had to fix cars and trucks that lost the left rear wheel, too many times to count. '47 Ford, '59 Ford, '63 Merc, Ford pickups, were all our vehicles, and a few neighbours brought theirs over to get fixed. '70 Chev 3-ton, '62 Pontiac, many more. All left side, all but the Pontiac were rear wheels. Coincidence? I think not!
  20. BigBlockMopar
    Joined: Feb 4, 2006
    Posts: 1,360


    Perhaps (just thinking out loud here) because wheel technology wasn't upto snuff yet and wheels at the time were too 'flexible' for the engineers to think the lugnuts would work themselves loose during use?
  21. Mark H
    Joined: May 18, 2009
    Posts: 1,461

    Mark H
    from Scotland

    Gotgas is correct.It's a sound engineering principle in order to reduce the risk of the L/H wheelnuts coming loose in forward motion.Probably over-engineering as far as cars are concerned.Used by many high end manufacturers including Rolls Royce.
    Don't know about now but,used to be used on many heavy and specialist vehicles.
  22. My 56 Cadillac hearse has lh studs as well. Don't know if it was all caddys of that time or just commercial chassis ones.
  23. GTS225
    Joined: Jul 2, 2006
    Posts: 1,175


    I suggest the left-hand, left side "phenomenon" is due to early cars having spindle-mount wheels/rims with a single spindle nut, and the tradition carried over to the multi-lug hubs/wheels. Even today, when running true knock-offs, the left-hand thread goes on the driver's side. (Just ask anybody with a blinged-out ride and 20" rims.)
    The reason we hear so much about it with Chrysler products is that they carried it on up to '70 or '71.

  24. I don't see what difference it makes as long as ya know it. I wouldn't go though the work to change it, just me I guess.
  25. I agree with you. If the proper tension is achieved in the stud thru the torque applied the nut should not loosen.
  26. Zerk
    Joined: May 26, 2005
    Posts: 1,418


    The engineering term for the "need" to have LH wheel studs is called precession. It is also the reason that bicycle pedals are threaded L and R.

    I've driven lots of cars with all kinds of lug nuts, and never lost a wheel. Just lucky, I guess.
    slack likes this.
  27. Buick, Studebaker just to name a couple that I know for a fact used lefties and righties. With the Buicks its a little harder because that used studs and threaded flanges instead of lugs and nutz.
  28. 54 savoy
    Joined: Jan 10, 2009
    Posts: 424

    54 savoy

    if anyone needs the bolts i got mine from roberts motor parts they have rh and lh, mopars ,backwards threds, upside down keys,gotta love um.
  29. Rob Baker
    Joined: Sep 11, 2014
    Posts: 5

    Rob Baker

    How would you change these over to rh thread?
  30. Rob Baker
    Joined: Sep 11, 2014
    Posts: 5

    Rob Baker

    does anyone no where to get left hand thread studs and nuts?

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