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Topic Review (Newest First)
07-26-2011 02:21 PM
Flow Control valve needed

What is needed to connect a GM p/s pump, rated at 3gpm, to a Mustang II rack, using 2 gpm, is a flow control valve. Speedway Motors has them, under $20, when I bought mine. It screws into the back of the p/s pump, replacing the control valve already in use. I have a the same set up and it cured my problem. Problem known as the "twitch" commonly caused by mating a GM pump to a Ford rack.
07-02-2011 11:36 PM
aosborn Typically to be very effective you need to reduce volume and pressure. I use the P/S valve for the same pump from a 4 cylinder car, it has a small orifice. Then adjust the shim pack to reduce spring pressure. That is the inexpensive way to go.

07-02-2011 09:17 PM
Cape Cod Bob After rereading the original post I see he refers to volumn. I'm pretty sure he means pressure as the gm pump puts out I think over 1000 lbs. pressure and the MII rack needs less around 8-900 lbs . Don't qoute me on exact #'s. A search on this forum will turn up a lot of info as this has been discussed many times.
07-02-2011 08:33 PM
tomslik well, is he trying to reduce pressure OR volume?

my GUESS would be pressure but i could be wrong

if it's pressure, don't get to excited, i've ran my MII rack (used) for many miles with a run-of-the-mill gm (not for r&p) pump.

if you're REALLY worried, grap a pump off an early omni (remember those POS?) or a mopar FWD wih a saginaw pump and use it....

some of you guys really make stuff complicated....
07-02-2011 08:11 PM
Cape Cod Bob
Originally Posted by tomslik
guys, volume and pressure are 2 different things...
Absolu tly correct. And how does that knowledge help answer his question. Please explain, Bob.
07-02-2011 08:59 AM
tomslik guys, volume and pressure are 2 different things...
07-01-2011 08:32 PM
Cape Cod Bob I tried shims and some have good luck but mine is still to loose so if I were you I would go with the reducer.
07-01-2011 09:13 AM
slow4dr I would run the adjustable one that Heidt's sells.

06-30-2011 05:42 PM
nitrus02 What reducer should I use? Do you have a part#? I have a 1982 chevy 350.
06-30-2011 05:17 PM
nitrus02 The rack works perfectly in the truck just needed to know if I need to reduce the pressure before I do any damage to the seals. I'm always concerned with safety the main reason for using it is because its the perfect size.
06-30-2011 01:15 PM
slow4dr Yes, you will need to reduce the pressure. Free isn't always a good thing, if the geometry isn't right your safety will be compromised.

06-29-2011 10:51 PM
Mustang power rack

I am using a pinto suspension, a chevy power steering pump, and a 94 Mustang steering rack. I wanted to know if I need to use a volume reducer in the newer mustang rack?

I've read post saying that you need to use one on mustang 2 rack but nothing on newer racks.

The reason for using the 94 rack is because it was free and it was wider so I didn't need to expend it to work. Just need to know I need a volume reducer?


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