Don't use offset rack bushings when converting your power steering - Ford Mustang Forums : Corral.net Mustang Forum
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post #1 of 12 Old 03-18-2017, 10:31 PM Thread Starter
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Don't use offset rack bushings when converting your power steering

I'm in the middle of replacing my sloppy steering system in my 90GT and thought I read all I need to know about when converting my stock fox body steering system to a 94-04 (specifically an 03 Cobra spec rack and pinion unit).

I've used offset rack bushings when I lowered my car years ago but when installing a newer generation rack and pinion the hydraulic lines are not routed the same way. Because of this, your frame will come in contact with your hydraulic line and this is a huge no go. Maximum Motorsports specifically states not to use offset rack bushings due to changing your geometry and bump steer but I have discovered another problem that I have not read about yet in my research. I'm changing to regular solid rack bushings and will also install a bump steer kit now and replace the offset bushings I had previously installed.

I've never had a problem with bump steer in the past but installing a newer generation rack that has hydraulic lines routed differently will effect your install if you have offset bushings.

I hope this helps others when converting your fox body steering system to a 94-04 steering system.

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post #2 of 12 Old 03-19-2017, 12:37 AM
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What do you mean by the lines are routed differently, mine were in the exact same place when I added an 04 Rack to my 92GT?


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post #3 of 12 Old 03-19-2017, 07:52 AM
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What do you mean by the lines are routed differently, mine were in the exact same place when I added an 04 Rack to my 92GT?
This has also been my experience, both on my '92 GT and on my '93 LX 2.3.
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post #4 of 12 Old 03-19-2017, 02:29 PM Thread Starter
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I'll have to take a pic later comparing both of them.\

Edit: The routing of the transfer tubes on the rack is just different between the two racks.

1990GT- New suspension, 5 lug Cobra disk brakes, King
Cobra clutch, FRPP 7003Z T5, aluminum drive
shaft and 3:55 gear. Daily driver with 200K plus
miles.
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post #5 of 12 Old 03-19-2017, 11:20 PM
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Originally Posted by cda97 View Post
I'll have to take a pic later comparing both of them.\

Edit: The routing of the transfer tubes on the rack is just different between the two racks.
Do you mean the Balance Tube that connects the Rack Boots, all you have to do is rotate the Boots on each end to change the position of the tube.

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post #6 of 12 Old 03-20-2017, 06:53 AM Thread Starter
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Do you mean the Balance Tube that connects the Rack Boots, all you have to do is rotate the Boots on each end to change the position of the tube.
No, the actual pressure and return hard lines on the rack itself.

1990GT- New suspension, 5 lug Cobra disk brakes, King
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shaft and 3:55 gear. Daily driver with 200K plus
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post #7 of 12 Old 03-20-2017, 10:46 AM
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Originally Posted by cda97 View Post
No, the actual pressure and return hard lines on the rack itself.

I ran into this too when I installed my 03/04 Cobra rack as well. I used standard bushings, and one of the pressure lines that ran down to the rack itself contacted the k-member very slightly.

I had to carefully rebend the tube a tiny bit to avoid hitting. My clearance is small, maybe 1/8" of so, but I installed stiffer rack bushings, so not concerned with movement too much here.

Seems like these two lines may be bent differently depending on what rack you get, and who rebuilt them. Mine was a cardone 22-2000 rack, and it was the top pressure line that hit slightly. If I had offset bushings lifting the rack up, it definitely would not have cleared.

Perhaps I can get a pic at some point to illustrate what I mean

Mike
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post #8 of 12 Old 03-20-2017, 04:14 PM Thread Starter
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Originally Posted by Mustang5L5 View Post
I ran into this too when I installed my 03/04 Cobra rack as well. I used standard bushings, and one of the pressure lines that ran down to the rack itself contacted the k-member very slightly.

I had to carefully rebend the tube a tiny bit to avoid hitting. My clearance is small, maybe 1/8" of so, but I installed stiffer rack bushings, so not concerned with movement too much here.

Seems like these two lines may be bent differently depending on what rack you get, and who rebuilt them. Mine was a cardone 22-2000 rack, and it was the top pressure line that hit slightly. If I had offset bushings lifting the rack up, it definitely would not have cleared.

Perhaps I can get a pic at some point to illustrate what I mean
I have the same rack that I bought from Rockauto that has the SPR-ZM casting number.

1990GT- New suspension, 5 lug Cobra disk brakes, King
Cobra clutch, FRPP 7003Z T5, aluminum drive
shaft and 3:55 gear. Daily driver with 200K plus
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post #9 of 12 Old 03-20-2017, 06:08 PM
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Here's pics of the line routing vs my old fox rack and the SN replacement. That one line cutting over is what gave me issues. Did clear fine wth a little persuasion
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File Type: jpg IMG_0730_1490047681548.jpg (114.2 KB, 32 views)
File Type: png IMG_0733_1490047696328.PNG (1.76 MB, 34 views)
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post #10 of 12 Old 03-21-2017, 07:21 AM Thread Starter
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Quote:
Originally Posted by Mustang5L5 View Post
Here's pics of the line routing vs my old fox rack and the SN replacement. That one line cutting over is what gave me issues. Did clear fine wth a little persuasion
Yep, that's exactly like mine, thanks for sharing your pics.


1990GT- New suspension, 5 lug Cobra disk brakes, King
Cobra clutch, FRPP 7003Z T5, aluminum drive
shaft and 3:55 gear. Daily driver with 200K plus
miles.
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post #11 of 12 Old 03-21-2017, 09:22 AM
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It might also be related to the rebuilder. I've looked at some pics of SN95 racks on the net, and the extremity of how far over that line is varies. Some might be fine, some might be too much.

Like I said before, with standard bushings, that single line just barely contacted the K-member. Only took me a minute to clearance the line better, but with offset bushings lifting the rack up, I would have had major issues

Mike
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post #12 of 12 Old 03-22-2017, 12:21 AM
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I had no clearance issues at all but mine was not a rebuilt unit.

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