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Old 12-18-2010, 02:46 PM
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fleetsidelarry fleetsidelarry is offline
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"Mustang II" power steering hose fitting sizes

I have a '48 Chevy coupe that the original owner installed a Mustang II crossmember and rack in. It is FoMoCo and worn out and nasty enough to truly be a Mustang II. It mounts on 16" centers.

Recently at the Turkey Run in Daytona I bought a reman rack from one of the street rod parts vendors. I already knew that what is called a Mustang II in street rodding is not really apparently a Mustang II so I knew enough to buy the offset bushings at the same time from the vendor. I wasn't prepared for the taller pinion (which I can work around by shortening my steering shaft).
The difference in the pressureside fitting into the rack is frustrating me right now.

I'm running the older style GM pump with a 3/8 inverted flare out. My old hose fit the pump and had a Ford fitting (5/16 tubing with a male 5/16 o-ring flare (1/2X20) for the rack. Naturally the new rack is different. The pressure side fitting is slightly larger.

I been reading previous threads on HotRodders and have seen a reference to 9/16X18 being the size I need (which would be a swivel o-ring type which used 5/16 tubing). But I also found the Borgeson link on another thread and, when I talked to them, they said the fitting would be metric, 14 mm o-ring, which is what comes on their hose kit for hooking GM pumps to so-called Mustang II. 14mm and 9/16 are within a few thousanths of each other (11.5 thousanths or 1.15 hundredths).

I'm wanting to get a hose made locally (which is a 60 mile round trip for me since the local NAPA does not do power steering hoses) but want to be able to tell them what size fitting to use, of course. And, of course, the rack is already bolted in the car.

Does anyone know what fitting is on these non-original racks or does it matter whether its a 9/16 or a 14 mm?

Sorry for the long post.
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