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Old 01-23-2018, 05:42 PM
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Power steering pump

Most street rods that have a MII style front end with power steering also have a GM engine and GM pump. Seems the GM pump puts out more pressure than the Ford rack requires which causes twitchy steering. One solution is to use a pressure reducer in the GM pump BUT has anyone used a Ford pump to get the job done? Can't find the specs on pumps but it looks like a 1990 Escort pump should fit the bill. Next would be the mounting but that's the fun part of building.

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Old 01-24-2018, 05:10 AM
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A bit off topic, but I just purchased a 37 Pontiac sedan with the Mustang II front end & GM pump. The PO had a stroke and is unable to communicate much info, what fluid does this system use?
Thanks, Bob.
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Old 01-24-2018, 05:48 AM
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Thunder Rack

I too have a Mustang II front end in my 36 Chevy. I used an 88 Thunderbird Rack and Pinion instead of the Mustang unit since it was designed to handle the higher pressure of a GM pump.

I used the Type II Pump with remote reservoir since the Saginaw Type I would not fit based on my short water pump set up and tight frame rails. They use standard power steering fluid.

You can look at my photo album to see what the mount set up looks like.
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Old 01-24-2018, 07:59 AM
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Power steering pump

I too used the T'bird rack for the same reason, pressure matching. I was at a repair garage and noticed the compact Ford pump and it got me to thinking that this could be a solution for other people that have twitchy steering even after installing "the fix".

Lot of people use automatic transmission fluid in their steering system.
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Old 01-24-2018, 09:33 AM
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P.S. Fluid

I would not use any ATF in a P.S. system. There are additives in the ATF that are not compatible with P.S. pumps and the Racks. Your best bet is to use a Quality P.S. Fluid. The cost is minimal and the benefits great.
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Old 01-24-2018, 10:00 AM
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Most guys use the GM pump on an SBC because it is the path of least resistance. Using the ford pump would require making a custom mount for the pump which is extra work and expense.

Sam
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Old 01-24-2018, 10:46 AM
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Quote:
Originally Posted by zooma View Post
I too have a Mustang II front end in my 36 Chevy. I used an 88 Thunderbird Rack and Pinion instead of the Mustang unit since it was designed to handle the higher pressure of a GM pump.

I used the Type II Pump with remote reservoir since the Saginaw Type I would not fit based on my short water pump set up and tight frame rails. They use standard power steering fluid.

You can look at my photo album to see what the mount set up looks like.
Nice! I'll keep an eye on the rack and have already made a note regarding the 88 T-bird rack as a replacement. I have a lot to learn/figure out on this car,thanks.
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Old 01-24-2018, 11:54 AM
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Quote:
Originally Posted by onemoretime View Post
most guys use the gm pump on an sbc because it is the path of least resistance. Using the ford pump would require making a custom mount for the pump which is extra work and expense.

Sam
yup!! True
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Old 01-24-2018, 03:30 PM
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You may have a Tbird rack already. The mounting bolt spacing on the Mustang II rack is 15 1/2", and the Tbird is 16 1/2". Most crossmembers are drilled for both.

The reason you can't use the Escort pump with the Mustang II rack, it is set up for higher pressure racks. It is shared with the Mustang of the same year.

A better choice for a pump would be a Saginaw pump for a mid 80s Omni/Horizon That pump is set for the lower pressures, and fits the GM bracket.
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Old 01-24-2018, 04:34 PM
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Power steering pump

The reason I started this thread was to get inputs regarding alternate setups other than just MII/GM. Getting good inputs and hopefully will be useful to others in the future. Thanks.
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Old 01-28-2018, 06:16 PM
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i have a mustII with t-bird rack and a gm pump with the speedway flow reducer in it
it greatly reduced the twitchyness but didn't eliminate it
if i had to do it over i'd use the ford pump to match the rack (and 03 mustang hydroboost)
if your still at that stage DO IT!
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Old 01-29-2018, 03:14 AM
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I'n using an oddball (cheap) timing cover/pulley/bracket setup on the Hemi in my 37 Dodge........stock (thick) timing cover, long BB Chevy WP, OE Mopar and Chevy pulleys. I also have a MII rack. When it came time to add the PS pump I considered using a Ford pump but the 70s stock style pump originally used with these racks is relatively long and wouldn't fit where I wanted to place it.

I had a core 60s-70s Federal (MOPAR) pump and brackets sitting around and opted to use that instead. I spent a couple hours building/modifying brackets for it (while the engine was still on the test stand) and it turned out pretty well.


HPS by M Patterson, on Flickr



The pressure on the Federal pump is lower than the Saginaw pump, but still higher than the Ford unit that being said it works well and has a nice feel to it.
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Old 01-29-2018, 07:52 AM
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Here's a rather pricey option, but fully adjustable to suit. Replaces the factory flow fitting in the pump...



Russ
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Old 02-04-2018, 09:19 AM
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If this small valve above regulates fluid flow.......i Don't like it -because if its like the ---Heidts black 4 -way valve for this cure--- The Gary heidts valve- i installed in my 50 merc. Which in turn adjusted supposedly the pressure between the P/S pump and the steering box, Which are in----------- my 50 Merc - a 77 - f-150 ford truck as called for. and a Gm early P/S box, I took it out, and sold it .No way did it work. not even a little bit.I have still, have that "driving all the time" twitchy feeling --in this Merc. any ideas on this lets here them please . thank you bob s

ps i just thought we were in this post same problem, thanks
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Old 02-04-2018, 11:59 AM
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https://www.summitracing.com/parts/brg-899001

ATF has more detergents in it than Power steering fluid, other than that it is just hydraulic oil.

More detergents keeps the system cleaner and suspends the dirt so it can be easily flushed out with a system flush

Some vehicles have a hydraulic engine cooling fan, and the system may require one or the other. My 04 Grand cherokee required steering fluid because it had a hydraulic fan setup
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