Power Steering Gear Replacement

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sgtjd

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My Mustang is a 1973, MACH I, 351C, produced in May 1973 with power steering. I need to replace the power steering gearbox but need some advice.

I assume that my gearbox is variable ratio being that its a MACH.

But which to choose. I seen quick ratio, Power Steering Other Tag, Power Steering Tag SPA-A, Power Steering Tag SPA-S, Power Steering Tag SPA-T, Power Steering Tag SPA-U. Not sure which one to get.

Also do you keep with the standard gear or switch up to the quick ratio.

I've also seen plenty of sources:

NAPA

NPD

SUMMIT

buyautoparts.com

carpartswarehouse.com

Please assist

 

c9zx

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My Mustang is a 1973, MACH I, 351C, produced in May 1973 with power steering. I need to replace the power steering gearbox but need some advice.

I assume that my gearbox is variable ratio being that its a MACH.

But which to choose. I seen quick ratio, Power Steering Other Tag, Power Steering Tag SPA-A, Power Steering Tag SPA-S, Power Steering Tag SPA-T, Power Steering Tag SPA-U. Not sure which one to get.

Also do you keep with the standard gear or switch up to the quick ratio.

I've also seen plenty of sources:

NAPA

NPD

SUMMIT

buyautoparts.com

carpartswarehouse.com

Please assist
The SPA T or V is a variable ratio box for 71/72/73. Also a 73 box listed for 73 is SPA AD or AF. I can not confirm. If you have a variable ratio box now you can use the NAPA rebuild program (Cardone) to have you box rebuilt. About $220. Chuck

 

sgtjd

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Fairborn OH
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1973 Mach 1
My Mustang is a 1973, MACH I, 351C, produced in May 1973 with power steering. I need to replace the power steering gearbox but need some advice.

I assume that my gearbox is variable ratio being that its a MACH.

But which to choose. I seen quick ratio, Power Steering Other Tag, Power Steering Tag SPA-A, Power Steering Tag SPA-S, Power Steering Tag SPA-T, Power Steering Tag SPA-U. Not sure which one to get.

Also do you keep with the standard gear or switch up to the quick ratio.

I've also seen plenty of sources:

NAPA

NPD

SUMMIT

buyautoparts.com

carpartswarehouse.com

Please assist
The SPA T or V is a variable ratio box for 71/72/73. Also a 73 box listed for 73 is SPA AD or AF. I can not confirm. If you have a variable ratio box now you can use the NAPA rebuild program (Cardone) to have you box rebuilt. About $220. Chuck
Would you also keep with the standard gear or switch up to the quick ratio.



My Mustang is a 1973, MACH I, 351C, produced in May 1973 with power steering. I need to replace the power steering gearbox but need some advice.

I assume that my gearbox is variable ratio being that its a MACH.

But which to choose. I seen quick ratio, Power Steering Other Tag, Power Steering Tag SPA-A, Power Steering Tag SPA-S, Power Steering Tag SPA-T, Power Steering Tag SPA-U. Not sure which one to get.

Also do you keep with the standard gear or switch up to the quick ratio.

I've also seen plenty of sources:

NAPA

NPD

SUMMIT

buyautoparts.com

carpartswarehouse.com

Please assist
The SPA T or V is a variable ratio box for 71/72/73. Also a 73 box listed for 73 is SPA AD or AF. I can not confirm. If you have a variable ratio box now you can use the NAPA rebuild program (Cardone) to have you box rebuilt. About $220. Chuck
Would you also keep with the standard gear or switch up to the quick ratio.

 
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sgtjd

Well-known member
Joined
May 20, 2011
Messages
83
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Location
Fairborn OH
My Car
1973 Mach 1
My Mustang is a 1973, MACH I, 351C, produced in May 1973 with power steering. I need to replace the power steering gearbox but need some advice.

I assume that my gearbox is variable ratio being that its a MACH.

But which to choose. I seen quick ratio, Power Steering Other Tag, Power Steering Tag SPA-A, Power Steering Tag SPA-S, Power Steering Tag SPA-T, Power Steering Tag SPA-U. Not sure which one to get.

Also do you keep with the standard gear or switch up to the quick ratio.

I've also seen plenty of sources:

NAPA

NPD

SUMMIT

buyautoparts.com

carpartswarehouse.com

Please assist
The SPA T or V is a variable ratio box for 71/72/73. Also a 73 box listed for 73 is SPA AD or AF. I can not confirm. If you have a variable ratio box now you can use the NAPA rebuild program (Cardone) to have you box rebuilt. About $220. Chuck
Would you also keep with the standard gear or switch up to the quick ratio.



My Mustang is a 1973, MACH I, 351C, produced in May 1973 with power steering. I need to replace the power steering gearbox but need some advice.

I assume that my gearbox is variable ratio being that its a MACH.

But which to choose. I seen quick ratio, Power Steering Other Tag, Power Steering Tag SPA-A, Power Steering Tag SPA-S, Power Steering Tag SPA-T, Power Steering Tag SPA-U. Not sure which one to get.

Also do you keep with the standard gear or switch up to the quick ratio.

I've also seen plenty of sources:

NAPA

NPD

SUMMIT

buyautoparts.com

carpartswarehouse.com

Please assist
The SPA T or V is a variable ratio box for 71/72/73. Also a 73 box listed for 73 is SPA AD or AF. I can not confirm. If you have a variable ratio box now you can use the NAPA rebuild program (Cardone) to have you box rebuilt. About $220. Chuck
Would you also keep with the standard gear or switch up to the quick ratio.
Also what type of fluid would you use in the pump for a 1973? Type F ATF or Power Steering fluid?

 

c9zx

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2020 Edge ST
2002 F250 V10
The SPA T or V is a variable ratio box for 71/72/73. Also a 73 box listed for 73 is SPA AD or AF. I can not confirm. If you have a variable ratio box now you can use the NAPA rebuild program (Cardone) to have you box rebuilt. About $220. Chuck
Would you also keep with the standard gear or switch up to the quick ratio.



The SPA T or V is a variable ratio box for 71/72/73. Also a 73 box listed for 73 is SPA AD or AF. I can not confirm. If you have a variable ratio box now you can use the NAPA rebuild program (Cardone) to have you box rebuilt. About $220. Chuck
Would you also keep with the standard gear or switch up to the quick ratio.
Also what type of fluid would you use in the pump for a 1973? Type F ATF or Power Steering fluid?
Type F with no problems. Chuck

 
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I have a low rust/lots of dents '71 sportsroof.
sgtjd,

I had my steering box converted to the 12.7: 1 quick ratio. I had to wait for several weeks to get it returned, but it was worth the wait.

http://www.powersteering.com/

mustang7173
Thanks for the tip. They're near a place I hit for dinner once in a while so we'll check them out. I had planned on a Jeep box but this option looks a lot easier.

 

sgtjd

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I went with the following last year...Lares 807 from RockAuto... they had it in stock at the time.

http://www.7173mustangs.com/thread-quick-ratio-steering-box

Is your current box leaking?.. also I would check the Pitman arm, mine was pretty worn, and was a PIA to beak free from the center link.

Good Luck.
My gearbox is leaking a lot to include having some slack in there. I believe the gears are just worn out. Pitman arm was replaced two years ago and is good to go.

 

mrmach1

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How do you inspect a pitman arm for wear? Is it a visual inspection or do you have to disassemble the arm?

 
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sgtjd

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Now that the mustang is out of storage I looked for the tag and there is none. I did see several numbers stamped on the top side. They are

7812145

73 in a circle 76 in the middle and DC in a circle.

I also saw another stamp which read 130 S

Trying to figure out which steering box to get:

Mustang was built in May 1973

Power Steering Tag SPA-A

Power Steering Tag SPA-S

Power Steering Tag SPA-T

Power Steering Tag SPA-U

Please assist.

 
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