Hydroboost fluid.
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FTE Legend
Joined: Aug 2004
Posts: 37,887
Likes: 20
From: North Central Rural Sask.
Hydroboost fluid.
Hey guys and gals,
For those of you that have done the hydroboost conversion, what kind of fluid are you running?
I did the complete swap from a 91 superduty, and put in some ATF, and it's pretty whiney when it gets a load on the system. I can see I have to flush it out, and figured I would see what everyone runs for fluid in there's. Hoping to get rid of the whine.
Everything worked good with no noise when it was installed in the superduty.
For those of you that have done the hydroboost conversion, what kind of fluid are you running?
I did the complete swap from a 91 superduty, and put in some ATF, and it's pretty whiney when it gets a load on the system. I can see I have to flush it out, and figured I would see what everyone runs for fluid in there's. Hoping to get rid of the whine.
Everything worked good with no noise when it was installed in the superduty.
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FTE Legend
Joined: Aug 2004
Posts: 37,887
Likes: 20
From: North Central Rural Sask.
Thanks for the reply, my truck has the complete system from the superduty, including the pump. Not sure if the gm and ford pumps use the same fluid.
Junior User
Joined: Dec 2019
Posts: 71
Likes: 0
From: South Dakota
Woah I didn't know that, so you're saying the old ford thompson "pencil neck" pumps should use ATF? I have a pencil neck pump on a 390 that is pumping to a '79 4wd steering gear and it does whine quite a bit! What kind of ATF?
FTE Legend
Joined: Nov 2015
Posts: 30,935
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From: Angier, NC
Hey guys and gals,
For those of you that have done the hydroboost conversion, what kind of fluid are you running?
I did the complete swap from a 91 superduty, and put in some ATF, and it's pretty whiney when it gets a load on the system. I can see I have to flush it out, and figured I would see what everyone runs for fluid in there's. Hoping to get rid of the whine.
Everything worked good with no noise when it was installed in the superduty.
For those of you that have done the hydroboost conversion, what kind of fluid are you running?
I did the complete swap from a 91 superduty, and put in some ATF, and it's pretty whiney when it gets a load on the system. I can see I have to flush it out, and figured I would see what everyone runs for fluid in there's. Hoping to get rid of the whine.
Everything worked good with no noise when it was installed in the superduty.
I can tell you 86 GM diesel with hydro boot use power steering fluid but cant say what a 91 SD uses.
As for the round body Ford pumps I have heard they make noise and why on the later 80's trucks / vans use the GM style pump.
I converted my 81 F100 to the GM style pump.
Dave ----
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FTE Legend
Joined: Aug 2004
Posts: 37,887
Likes: 20
From: North Central Rural Sask.
Thank you so much, appreciate it a ton!
Will grab some type f and flush outtout mercon v I have in there now.
Will grab some type f and flush outtout mercon v I have in there now.
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Laughing Gas
Joined: Jan 2016
Posts: 828
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From: Hartford, WI
I just did the Hydroboost conversion a couple of months ago. Got the complete kit from Wild Horses 4x4 for my 77 F150 4x4.
They use and recommend Swepco 715. So I cleaned out my system the best I could and switched it over.
I rebuilt a spare Saginaw pump I had for my 73 Formula Firebird. Picked up a new dual return reservoir from a place in MN.
Even if you used GM or ATF transmission fluid I don’t see that being a problem/issue at all.
If you got the whine in the system and the steering or braking is funny then you got air in the system and you need to bleed the system. Also check all of your hose connections or any leaks. That can be a source of your problem as well.
They use and recommend Swepco 715. So I cleaned out my system the best I could and switched it over.
I rebuilt a spare Saginaw pump I had for my 73 Formula Firebird. Picked up a new dual return reservoir from a place in MN.
Even if you used GM or ATF transmission fluid I don’t see that being a problem/issue at all.
If you got the whine in the system and the steering or braking is funny then you got air in the system and you need to bleed the system. Also check all of your hose connections or any leaks. That can be a source of your problem as well.
Logistics Pro
Joined: May 2010
Posts: 4,436
Likes: 19
From: Regina, Saskatchewan
If you've got a rebuild pump and clean hydroboost system, you can use any type of fluid you want really.
I rebuilt my 2001 Superduty CII pump with a rebuild kit, cleaned everything thoroughly, and cleaned out the power steering box (1979 F250 original box), and everything works perfectly with Mercon V. No leaks. No whining, unless at full lock... but full lock whine is to be expected.
As long as you've got a clean system to start with, pick a fluid and go with it
Mixing two types is where things go wrong (Type F and Mercon V don't mix).
I rebuilt my 2001 Superduty CII pump with a rebuild kit, cleaned everything thoroughly, and cleaned out the power steering box (1979 F250 original box), and everything works perfectly with Mercon V. No leaks. No whining, unless at full lock... but full lock whine is to be expected.
As long as you've got a clean system to start with, pick a fluid and go with it
Mixing two types is where things go wrong (Type F and Mercon V don't mix).
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