Steering rack limiter?

Help Support 7173Mustangs.com:

luxstang

VIP Members
Staff member
Moderator
Joined
Dec 23, 2010
Messages
6,618
Reaction score
73
Location
Luxembourg / Europe
My Car
1972 Mustang Convertible
Does anybody know if there is a steering rack limiter available for our cars? Or if there is another remedy?

I need to prevent the front left tire from rubbing on the frame rail when turning it all the way to the left. They complained about it during inspection and it won't pass next time if the problem persists. 
I know that the problem is common to our cars but they don't care. 
 

 

Fabrice

VIP Members
Joined
Mar 30, 2017
Messages
2,081
Reaction score
358
Location
The Netherlands
My Car
73 Grande 351C
71 Mach 1 429CJ
Very happy to see the @[email protected] is still in your hands!

Common? Tbh I've never heard of that one unless you'd have extra large tires > 255.
May be there is a way to limit the original saginaw box rotations?

One quick trick would be to pass the control with another set of thinner wheels/tires.

 
Joined
Sep 12, 2015
Messages
5,432
Reaction score
631
Location
SW Ontario
My Car
1971 Mustang Mach 1, M code, 4 speed.
The only way I know of to limit turn travel is to change the stop shim or end plug in the PS box. Has you PS box been rebuilt? I'm wondering if it was assembled incorrectly although that is hard to believe unless incorrect parts were used. If that's not the case then my uneducated guess is something else is wrong, like alignment.

 
Joined
Aug 14, 2014
Messages
3,385
Reaction score
383
Location
Madison, WI
My Car
1971 M-Code Mach 1 w/408C stroker
When turning to the left you are probably hitting the nut that holds the gear box. I have two ideas:

-Depending on how much they are touching, you may be able to grind a little of the nut without compromising its integrity.

-From factory the stop point is when the spindle contacts the LCA. You could drill the LCA to add a bolt and locknut. You then can adjust the stop point by tightening or loosening the bolt. This is what my aftermarket LCAs have. However, the stock ones may not have enough meat there to drill a hole without weakening, which means that you will have to reinforce around it. Or perhaps just weld shims to achieve the desired stop point. All depending on how much of the stock look you want to retain.

-Edit PS: another one could be to add a thin enough wheel spacer to push the wheel a few tens of an inch outwards.

 
Last edited by a moderator:

luxstang

VIP Members
Staff member
Moderator
Joined
Dec 23, 2010
Messages
6,618
Reaction score
73
Location
Luxembourg / Europe
My Car
1972 Mustang Convertible
The only way I know of to limit turn travel is to change the stop shim or end plug in the PS box. Has you PS box been rebuilt? I'm wondering if it was assembled incorrectly although that is hard to believe unless incorrect parts were used. If that's not the case then my uneducated guess is something else is wrong, like alignment.
Alignment is fine. I don't think the PS box has ever been rebuilt. It might be because of the 255 tires though but if I remember correctly it also did it with the 235 ones..... 

 

luxstang

VIP Members
Staff member
Moderator
Joined
Dec 23, 2010
Messages
6,618
Reaction score
73
Location
Luxembourg / Europe
My Car
1972 Mustang Convertible
When turning to the left you are probably hitting the nut that holds the gear box. I have two ideas:

-Depending on how much they are touching, you may be able to grind a little of the nut without compromising its integrity.

-From factory the stop point is when the spindle contacts the LCA. You could drill the LCA to add a bolt and locknut. You then can adjust the stop point by tightening or loosening the bolt. This is what my aftermarket LCAs have. However, the stock ones may not have enough meat there to drill a hole without weakening, which means that you will have to reinforce around it. Or perhaps just weld shims to achieve the desired stop point. All depending on how much of the stock look you want to retain.

-Edit PS: another one could be to add a thin enough wheel spacer to push the wheel a few tens of an inch outwards.
Thanks. I'll give that a try. I thought there might exist some kind of Gadget that would do the job but I'll try this method you mentioned,

thanks a lot! 
A spacer is out of the question as there is a very tiny gap between the fender and the tire because of the lowered suspension. 
 

 
Joined
Sep 12, 2015
Messages
5,432
Reaction score
631
Location
SW Ontario
My Car
1971 Mustang Mach 1, M code, 4 speed.
Alignment is fine. I don't think the PS box has ever been rebuilt. It might be because of the 255 tires though but if I remember correctly it also did it with the 235 ones..... 
I have 235 tires on the front and no issue with lock to lock. Something just doesn't add up here.

 

Bentworker

VIP Members
Joined
Jan 17, 2015
Messages
1,479
Reaction score
188
Location
California
My Car
71' Grande project.
When your wheels are straight what is the position of the pins on your rag joint?  Are they at 12 and 6 O'clock?

 

Bentworker

VIP Members
Joined
Jan 17, 2015
Messages
1,479
Reaction score
188
Location
California
My Car
71' Grande project.
You could probably pop the hood and spy around the brake booster with a flashlight to see the rag joint from the top side.  It is a congested part of the engine bay.

 

Hemikiller

VIP Members
Joined
Jul 12, 2010
Messages
3,322
Reaction score
514
Location
Killingworth, CT
My Car
71 Mach 1
65 coupe
Put a hose clamp on the steering stop on the strut rod. That'll stop it from traveling too far and hitting the frame rail for inspection. You could put it on the spindle if that's less conspicuous. 

 

Bentworker

VIP Members
Joined
Jan 17, 2015
Messages
1,479
Reaction score
188
Location
California
My Car
71' Grande project.
If your rag joint pins prove out to be at 12 and 6 O’clock with the wheels straight it proves that your car was aligned with your steering box centered.  If not it means that the steering box is not centered and you will have an unequal amount of travel left to right.

If it is centered, and still rubs when turning left you could swap steering box piston caps to limit left travel.  It isn’t hard, just a big snap ring to remove.  One from a F-body GM application is taller and would reduce travel.  It is also a possibility that the one on your box wasn’t from a mustang application if the box has ever been rebuilt.

 
Joined
Aug 14, 2014
Messages
3,385
Reaction score
383
Location
Madison, WI
My Car
1971 M-Code Mach 1 w/408C stroker
If your rag joint pins prove out to be at 12 and 6 O’clock with the wheels straight it proves that your car was aligned with your steering box centered.  If not it means that the steering box is not centered and you will have an unequal amount of travel left to right.

If it is centered, and still rubs when turning left you could swap steering box piston caps to limit left travel.  It isn’t hard, just a big snap ring to remove.  One from a F-body GM application is taller and would reduce travel.  It is also a possibility that the one on your box wasn’t from a mustang application if the box has ever been rebuilt.
My thought is, and I was just looking at this issue two days ago, that on the driver's side the tires will first make contact with the nut that holds the steering box. Since this nut is not in the passenger side, there is about 1/8" to 1/4" more travel on that side before the tires rub. Since he has 255s that very well could be the issue so he has to slightly extend the steering stop when turning to the left.

 

Bentworker

VIP Members
Joined
Jan 17, 2015
Messages
1,479
Reaction score
188
Location
California
My Car
71' Grande project.
I just checked. They are more or less 12 and 6 o'clock. Just a little off. 
If you could sit in your drivers seat and engage x-ray vision to look through the dash and firewall are the coupler pins more at 1 and 7 o-clock or 11 and 5 o-clock?  If it is 1 and 7 you have more steering box travel to turn left and that may be your issue.  With the pins at 12 and 6 your steering wheel should be straight.  Sometimes along the line the steering wheel gets pulled and installed a little off, then the car gets aligned to make the steering wheel appear proper- when it is not.

 
Top