J-car rack and pinion

Discussion in 'Classic Mustang Specific Tech' started by 71vert-pga, Jul 4, 2004.


  1. 71vert-pga

    71vert-pga New Member

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    Just talked to the engineer again. He said the rack he mentioned earlier is just a j-car rack.

    He also explained that the reason we don't see racks with more travel than this is that it's not needed. The old worm gear systems (especially before power assist) needed long throws to provide the leverage necessary to turn vehicles at the time. Systems now don't require the leverage and therefore have shorter spindle arms and less total travel.

    From the photo above you can see that "if you want" you could widen the window in the front of the Cavalier rack slightly to equal the mustangs original travel. Add Duane's crossmember and be done. Or just use the stock rack with no modifications and never notice the difference in turning radius.

    And of course most of us have seen Randall's spindle modification to eliminate the problem.

    http://www.randallsrack.com/GranadaSpindlemodification.html
     
    #81
  2. jikelly

    jikelly Advanced Member

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    Hey 71vert, where are you on this rack? I finally got my wiring harness in and have been driving my stang the last two weeks and realized that I really need to get to work on my steering. I'll probable have to wait until the spring though since I'm doing student teaching this fall semester. Which means I have no free time and no money.
     
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  3. 71vert-pga

    71vert-pga New Member

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    Sorry Jim, it's still sitting in the garage. Haven't had time to touch anything in the last several weeks. I'm going to put a website together soon (as soon as I can get the time) with all the data I've got so far, but it may be a couple more months.

    I'll keep ya posted!
     
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  4. jikelly

    jikelly Advanced Member

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    Any updates?
     
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  5. 55crownvic

    55crownvic New Member

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    71vert-pga

    Hi, am new to this forum, and have installed the j-car rack in my 65 fairlane, however, it only has 2 turns lock to lock and it makes the car very twitchy and scary to drive. Have found and installed a 2 1/2 turn lock to lock rack from a 96 buick skylark and it is much better. BUT what I am really looking for is a rack with 3 turns lock to lock, that would then be perfect. So, my question is, describe the car you got your rack from, and you say it has 2.9 turns? I think that may work, but need to know exactly what car to search for in the yards.

    Thanks for the help.........Dave
     
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  6. Mustang67

    Mustang67 New Member

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    I just installed a power rack out of a 93 Grad Prix. I did have to fab a mounting brack and cut down the outer tie rods. I made use of the existing mounting holds for the new mounting bracket. I had the Speeds rack before, but upgraded to an AOD trans. The Speed rack would not clear the Hedman headers I had on before plus the hedman headers would not clear the AOD. I wanted to stay with long tube headers. I purchased a set of long tube headers from FPA that will clear the AOD trans. There is some limit to the turning radius, but it works. The Grad Prix rack doesn't have the issue with center mounted bolts.
     
    #86
  7. pazur

    pazur New Member

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    Hi, can you tell me what's tie rod arms length on spindles on your stang and grand prix, measured from about the same point?


     
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  8. 55crownvic

    55crownvic New Member

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    Well, it turns out I answered my own post from a few days ago. Went to the yard today and found a 2.9 turn lock/lock rack from an 86 cavalier station wagon w/2.0 motor. It has almost an inch more travel than the one I have in the car now, so that is good, that will increase my turning radius, but now I need to find a u-joint with splines as this rack has a splined shaft and my old rack(from a 96 skylark) has a 17mm DD shaft. Hopefully that wont be too hard to find.

    Dave
     
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  9. jikelly

    jikelly Advanced Member

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    I was shocked to see this thread back up here.
     
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  10. Mustang67

    Mustang67 New Member

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    I cut the arms down and threaded them again. I used a metric thread size that was the same as the size as the outer tie rod size.
     
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  11. 69gmachine

    69gmachine Member

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    Well having done this conversion myself (see pic)[​IMG], I can tell you that 1) the loss in turning radius is definitely noticeable, but liveable for something that you primarily go cruisng in. Just don't try to make a U-turn in heavy traffic on a two lane road. 2) There is a noticeable "propeller" effect when changing directions, because the two center bolts are very close together, and the shaft torques over before it begins to change directions. It's a little annoying while cruising around, but under hard driving conditions, you don't even notice it. RRS stabilized it with a patented guide bar. I don't know about Randalls or Steeroids. I don't have many miles on it as my valvetrain didn't survive it's first outing at the track so I can't really say how rugged it is. However, it stood up to (almost) two 20 minute track sessions and I was running P245-17 tires, so there was a good amount of force to contend with. If I had enough time, I'm sure I could come up with a way to prevent the centerlink from torquing over, but I'm just about ready to punt and buy a TCP rack. If I was going to do it right, I would have a new shaft machined with the bolt spacing about 14" apart. It may be possible to machine new holes in the existing shaft, but I've worked on it for almost 5 years now, and I'm ready to just drive it.
     
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  12. triostang

    triostang New Member

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    updates? I know the thread is old sorry, i just wanna know lol
     
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  13. jikelly

    jikelly Advanced Member

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    Wow this threed is like four years old.

    I gave up on the rack and pinion idea. I just got a rebuilt steering gearbox.
     
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  14. triostang

    triostang New Member

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    Did you rebuilt to a better ratio? isnt that possible?
     
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  15. jikelly

    jikelly Advanced Member

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    It is actually possible. There was one guy I found online who would rebuild the saginaw steering box with any ratio you wanted. I can't find a link to the place now though.

    This was interesting.
    http://www.wheelingarizona.com/tech/Hydro_info/DIY_saginawrebuild.htm
     
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  16. triostang

    triostang New Member

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    oh wow. I need to look into that
     
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  17. Tubo(2-bo)

    Tubo(2-bo) Member

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    Unisteers new power R&P is very simular to a Randal's. I replaced the manual Unisteer with the new power version, and the turning radius that was lost, is back to a stock radius now. Best of my knowledge they dont make a 71-73 version.
     
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  18. jikelly

    jikelly Advanced Member

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    Story of my life.
     
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  19. triostang

    triostang New Member

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    Why must they hate us so?
     
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  20. JeremiahJohnson

    JeremiahJohnson Member

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    I realize this thread is very old. But if any of you are still around, I am using a re-manufactured rack and pinion unit from a '92 cavalier. It has a 11/16" DD input shaft, but I cannot find a steering u-joint that is 11/16" DD, anywhere.

    Did any of you have this issue?
     
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