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Old 01-18-2012, 06:53 AM
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chev power steering pump to a ford rack

I had a roll over with my 34 ford because the guy that built the can didn't know to but a valve to control the pressure of the chev pump to the ford rack . This almost cost me my life. I am new to this site and love hot rods. This problem has cost me 75000 dollars .

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Old 01-18-2012, 08:21 AM
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Quote:
Originally Posted by potter7482
I had a roll over with my 34 ford because the guy that built the can didn't know to but a valve to control the pressure of the chev pump to the ford rack . This almost cost me my life. I am new to this site and love hot rods. This problem has cost me 75000 dollars .
Welcome aboard! Sorry to hear about your wreck, but I'm not understanding how the control valve would cause it. I'm sure the steering would "feel" different, but unless there was a mechanical failure how can you blame the valve?

Russ
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Old 01-18-2012, 08:53 AM
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Sure sorry to here about your rollover. Is the car totally gone ? I hope the insurance steps up and takes care of it.

Tell us about how the car acted going down the road. Some people around here say their car feels "twitchy" with the Ford/Chevy steering setup.

Any help would really help lots of people.

Welcome to HR.com.


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Old 01-18-2012, 10:01 AM
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I'm using a GM pump hooked up to a Chrysler rack & pinion, fortunately the truck was on jack stands for testing. I started the engine and everything seemed fine until I moved the wheel to the left a little it immediately shot to the right so fast it nearly broke my thumb. Two things were wrong, first the pump put out to much pressure and the rebuilt rack had been plumbed backwards making left right and right left.

The pressure issue was solved with an adjustable power steering valve. It works by sending excess pressure to the return line, this design does not depend on a spring to regulate pressure making it simple and safe, of course I also switched the lines on the rack. I'd read where GM used more pressure than Ford or Chrysler that's why I tested it on stands before driving it. Here's a link to the valve - http://www.speedwaymotors.com/Adjust...lve,14895.html

So far everything works great, I've done multiple quick left/right steering test at up to about 45 mph, I have a few more things to do before going any faster.

I had a bad experience with a chopped '30 Model A I built a few years ago, drove great at 40 mph but the first time I tried highway speeds all hell broke loose, I wanted to go left and the car wanted to go right. This was caused by suspension induced steering, it was solved with a Panard Bar, I've been driving it for over 5 years with no more steering problems.
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Old 01-18-2012, 10:54 AM
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Welcome to the forum. I'm sorry you rolled your new rod... but your experience is a good example for anyone who purchases a car that has been built by someone else. Caveat Emptor..... may the buyer be where. Buyers need to completely familiarize themselves with all aspects and idiosyncrasies a car might have, and if something is wrong or not to their liking they need to fix or modify the car before just charging off to the local car show. I'm not by any means saying you did this... just that your experience is a good example to novices as to what can happen.

Yes, if there isn't some kind of pressure limiting modification done to a Chevy pump when hooked to a Ford rack, the steering will be a bit "twitchy" but this alone won't cause an accident. There are two or three different solutions to this problem and they all work well, although to different degrees. I always use the pressure spring to lower the pressure while others prefer a valve to do the job. Both work but which one you use is based on personal preference.

Again, sorry you had this problem and I hope you enjoy your ride.. once it gets back on the road.

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Old 10-25-2013, 07:09 PM
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help

I have a Ford Ranger power rack but I prefer not to hook up the GM pumthat was included. Some say it w/b too hard to steer? Its light- somewhat narrow tires/weld wheels, no hood/fenders/bumper. If it is hard will the GM pump be too strong? Valves are expensive, whats the spring and/or other method you mentioned? Will any FORD manual rack fit the Ranger suspension? Not sure if the ranger rack was ever made manually (I have an EDGE with the TORSION BAR suspension, NOT COILS. thanks, George
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Old 10-26-2013, 01:32 AM
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Quote:
Originally Posted by burrpenick View Post
I have a Ford Ranger power rack but I prefer not to hook up the GM pumthat was included. Some say it w/b too hard to steer? Its light- somewhat narrow tires/weld wheels, no hood/fenders/bumper. If it is hard will the GM pump be too strong? Valves are expensive, whats the spring and/or other method you mentioned? Will any FORD manual rack fit the Ranger suspension? Not sure if the ranger rack was ever made manually (I have an EDGE with the TORSION BAR suspension, NOT COILS. thanks, George
There's an adjustable regulator available it bypasses flow from the high pressure side back to the reservoir via the return line, this allows you to fine tune the flow pressure.

I ended up fabricating adapters to mount a Mopar pump on a SBC, it's from the same model car that the rack came from problems solved.

I don't have any use for the regulator if you're interested.
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Old 10-27-2013, 10:00 PM
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My current set up is all Chevy, but I have driven one that had a Ford rack and a GM pump. There was NO road feel or feedback to the wheel at all! You could spin the wheel like a roulette wheel and the result was (in my view) extremely dangerous. There was no "self centering" of the wheel so it was way TOO easy to overcorrect at speed. I could see this as an accident looking for a place to happen.
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Old 10-28-2013, 07:37 AM
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Quote:
Originally Posted by Dave57210 View Post
My current set up is all Chevy, but I have driven one that had a Ford rack and a GM pump. There was NO road feel or feedback to the wheel at all! You could spin the wheel like a roulette wheel and the result was (in my view) extremely dangerous. There was no "self centering" of the wheel so it was way TOO easy to overcorrect at speed. I could see this as an accident looking for a place to happen.
I don't think you can blame that on the steering system. Most of your "self centering" should be handled by the caster side of the spindle alignment. If the suspension is not set-up correctly, or was built using mis-matched parts, this will cause most of the issues you were relating too.
Running a GM pump on a Ford rack will usually cause a "twitchy" feel. GM pumps run at around 1200 or 1300 PSI where as Fords MII racks require about half that pressure. Putting a reduction valve in the output side of the pump will help cure that.
Mark
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