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Technical Pittman arm question

Discussion in 'The Hokey Ass Message Board' started by BamaMav, Aug 4, 2021.

  1. scrappybunch
    Joined: Nov 16, 2011
    Posts: 369

    scrappybunch
    Member
    from nj

    Not sure what you mean by o-ring. GM installed stops of different thickness depending on carline model. In this pic you can see the stops on the end cap. The other stop is a metal ring in the bore of the housing, that can be removed. cap.jpg
     
    SS327 likes this.
  2. BamaMav
    Joined: Jun 19, 2011
    Posts: 5,554

    BamaMav
    Member
    from Berry, AL

    Got under the car today and did some more looking and measuring. Found out I'm going to have to have an arm that is bent about like the one I have now, a straight arm will hit the motor mount on the crossmember. So, I'm going to have to look at dropped arms for 4wd trucks since I'm not finding an arm with 7" hole centers and a drop to it. I don't have any way to bend one of the aftermarket flat style arms.

    That is interesting on the end caps. How do those come off? What would happen if you ground the stops off flat? Would that damage the box gears?
     
  3. nobby
    Joined: Jan 8, 2006
    Posts: 842

    nobby
    Member

    1999 jeep grand Cherokee
    Not cherokee
    Grand cherokee
    I think it's 1999 to 2004
    Long with drop, straight not canted,
    Power box 1 1/8 sector
    Small hole taper, that can be enlarged to 1'5 inches per foot 7 degrees
     
    topher5150 likes this.
  4. tj
    Joined: Aug 19, 2006
    Posts: 556

    tj
    Member

    Had a Vega box on a 34 with a beam axle. Switched to a mini rack and lost turning radius. Used a right tie rod end that has the tie rod mount integrated on it and corrected my problem.
     
  5. brading
    Joined: Sep 9, 2019
    Posts: 520

    brading
    Member

    You could make up a new pitman arm like this. Cut the splined end off, turn it down and weld in a new arm as per pictures

     

    Attached Files:

  6. topher5150
    Joined: Feb 10, 2017
    Posts: 2,731

    topher5150
    Member

    Wish I could find some dims online but that looks like it might work, and you can get them online fairly cheap.
     
  7. BamaMav
    Joined: Jun 19, 2011
    Posts: 5,554

    BamaMav
    Member
    from Berry, AL

    How do you get that end cap off, is it held on with a snap ring? Got to thinking I might be able to swap caps with the two boxes I have if it will make any difference. Does it just sit there, or is there a spring or something behind it putting outward pressure on it?
     
  8. scrappybunch
    Joined: Nov 16, 2011
    Posts: 369

    scrappybunch
    Member
    from nj

    Snap ring, there is a small hole to stick a punch in and push on the clip.
    The cap is one of the stops. To remove the other stop, the box will need to disassembled in order to remove the steel clip in the bottom of the bore.
    Plenty of online pics and instruction to take one apart and set up when reassembling.
     
  9. BamaMav
    Joined: Jun 19, 2011
    Posts: 5,554

    BamaMav
    Member
    from Berry, AL

    Thanks scrappy. I did a little looking on google last night and found an exploded view of the box. Think I'll just continue looking for a longer pitman arm. I'm not confident I can take my box apart and get it back together without it leaking, or worse yet, not work again.

    It's frustrating nobody list the specs on length and hole size on their pitman arms. I'm going to talk with my parts guy when I get a chance and see if he might still have a catalog that has the measurements in it. I would buy one like the Borgersen one, but I don't have any way to bend it, and the one Gimpy posted I don't think I could ever drill the small hole correctly. And no way would I weld one, I don't trust my welding that good!

    No rush on it, I can still drive it as is, just have to remember it doesn't cut very sharply.
     
  10. topher5150
    Joined: Feb 10, 2017
    Posts: 2,731

    topher5150
    Member

    I got the jeep pitman arm will that much of a length difference cause problems
    IMG_20220409_103927042_HDR.jpg
     
  11. nobby
    Joined: Jan 8, 2006
    Posts: 842

    nobby
    Member

    my bad, i thought the master spline clocking was straight, that appears to be about 20 degrees
     
  12. 2OLD2FAST
    Joined: Feb 3, 2010
    Posts: 4,060

    2OLD2FAST
    Member
    from illinois

    You don't know anyone with a torch , a vice & a crescent wrench ??
     
  13. 2OLD2FAST
    Joined: Feb 3, 2010
    Posts: 4,060

    2OLD2FAST
    Member
    from illinois

    Simply file out the flat that's in the way of the clocking you want
     
  14. BamaMav
    Joined: Jun 19, 2011
    Posts: 5,554

    BamaMav
    Member
    from Berry, AL

    Sadly, no. My older car guys have passed on, and don't know any younger than me. Still a few of us over 60 guys left, but none with a torch.
     
  15. BamaMav
    Joined: Jun 19, 2011
    Posts: 5,554

    BamaMav
    Member
    from Berry, AL

    I would think if I found one the length of that shiny one it would help. But it would still have to be bent a little.
    What is the spread measurement of the holes on the Jeep arm, center to center?
     
  16. seb fontana
    Joined: Sep 1, 2005
    Posts: 7,462

    seb fontana
    Member
    from ct

    I have a 2002 Jeep box screwed to my bench, arm is 6-1/2" long with hair over 1" drop. You must realize that the right wheel has to turn more on a right turn than it does when turning left. Get the wide spline out of the Pittman arm. Center the steering box. Put the Pittman arm on snug 2 spines to the right. With wheels strait ahead set drag link length [I would make a test one out of whatever is handy, pvc, etc]. Should be darn close to equal steering wheel turns between left and right. If not move the Pittman arm 1 spline in either direction, adjust drag link and test again. I know that consensus says to put the Pittman strait forward or 90° to drag link but you won't get the equal number of turns of the steering wheel.
     
    Last edited: Apr 9, 2022
    HemiDeuce likes this.
  17. seb fontana
    Joined: Sep 1, 2005
    Posts: 7,462

    seb fontana
    Member
    from ct

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  18. gimpyshotrods
    Joined: May 20, 2009
    Posts: 20,187

    gimpyshotrods
    ALLIANCE MEMBER

    I know, right?!
     
    seb fontana and SS327 like this.
  19. rdscotty
    Joined: Sep 24, 2008
    Posts: 225

    rdscotty
    Member
    from red deer

    It says in the ad Gimpy posted - "If you need the arm drilled, please call"
     
  20. nobby
    Joined: Jan 8, 2006
    Posts: 842

    nobby
    Member

    that universal pitman is great
    note - the thickness of the taper /\
    or the height of the taper.....
    generally talking early ford 1.5'' per foot 7 degrees
    it matters how thick the taper is
    IF early ford steering arms and pitmans were 1/16 fatter here
    you could switch to dodge w100 3/4'' left and right track rod ends 34'' unf EASY TO FIND LEFT AND RIGHT FULL TAP SETS bottom, plug and taper !! rather that 11/16-18 UAE LEFT/RIGHT
    19.050mm / 3/4'' and use 1'' 25.4mm cds tube rather than 7/8'' 22.2mm
    and have 6.50mm or 1/4 in half 3.25mm and 1/8 of meat about the threads
    tie rod ends.jpg

    also note the tie rod end from the drag link of a grand cherokee is 18mm - that fits that small taper
    probably 1.5 tpi - where I might have been - i.e. 18mm will tap into 1'' tube with a heavy wall.
     
  21. BamaMav
    Joined: Jun 19, 2011
    Posts: 5,554

    BamaMav
    Member
    from Berry, AL

    Sounds like the Jeep arm is the same size as what I already have. 6" between holes.

    You explained exactly how I lined mine up. Centered tires, centered the box, clocked the arm to fit both. I have the same travel left to right, just need a bit more to be able to turn sharper. I'll get there eventually, not really concentrating on it right now since it's driveable as is for now.
     
  22. seb fontana
    Joined: Sep 1, 2005
    Posts: 7,462

    seb fontana
    Member
    from ct

    6-1/2".. Maybe a Corvette pitman, 53-62 might be longer. Early 50's Chev pass car maybe the same. I know I hunted one down once but I can't remember what I did with it so I can't measure..
     
    Algoma56 likes this.

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