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Steering gear box?
#1
Ok guys I'm needing to change my steering gear box on my 73, my doesn't have the tag on it. Is there another way of telling which gear box I have? Fixed or variable. "73" 351c 2v power steering
Thanks
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#2
First my guess is fixed. Not really sure how you tell for sure though.

Next, how bad is your box that it needs changed? Do you have a spare? I am having mine rebuilt by powersteering.com and converted over to a quick ratio box at the same time. I just sent it off so I cannot give a review on their work but several other members on here have used them and were pleased. The rebuild and conversion together came to $398. I think just a rebuild is cheaper.

73 Grandé H Code. Headman long tube headers, T-5 Transmission, 3.70 Traclok, Lowered 1" all around, Aussie 2v heads w/ 2.19 intake, 1.71 exhaust, screw in studs, full roller cam 608/612 lift 280/281 duration LSA 112, Quick Fuel 750 CFM double pumper, AirGap intake.

- Jason


[Image: 082-hot-rod-power-tour-2017-1970-1970s.jpg]
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#3
I replaced mine with a lares 807. It is listed as 10:1 but it is really 12:1. I checked they are currently around $200 w/ a pretty hefty $200 core deposit. I believe the stock ratio box is a lares 806 and they are $175. (same $200 core deposit). It looks like these come with a new coupler as well

I would also check the pitman arm. Mine was pretty worn and had a significant amount of play in the socket.
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#4
If you are willing to pull the box apart a bit you can identify it.  Someone who knows what box they have might also be able to give you a lock to lock amount of turns and you could use that too.  I don't have a stock steering box anymore, mine is 12.7:1 with stock steering stops and mine is about 2 2/3rds of a turn lock to lock.   If you do decide to take it apart for identification I would be sure to keep everything squeaky clean and clean off the end of the sector shaft before you start.  The last thing you would want to do is damage a seal or introduce dirt into your steering system.

1) Remove pitman arm.
2) Center the input shaft (turn it to full lock left and right and split the difference.
3) Remove the 4 bolts on the sector shaft cap.
4) Tap the end of the sector shaft with a soft mallet to remove it.

Once the sector shaft is removed you just look at the teeth on the piston inside.  If all three teeth are the same depth it is a fixed ratio box.  If the center tooth has a deeper root it is a variable ratio box.  They look quite a bit different.  See post number 1 in the linked  thread for photos...  https://www.7173mustangs.com/thread-play...ebird-12-7
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#5
(04-21-2017, 07:25 AM)toastintx Wrote: Ok guys I'm needing to change my steering gear box on my 73, my doesn't have the tag on it. Is there another way of telling which gear box I have? Fixed or variable. "73" 351c 2v power steering
Thanks

can you take a picture of it? i have  73 and a 72 they are both the same.. but with a picture i will be able to see if it's original

73 Stang totally restored with a 351 cleveland cobra jet Q code motor ,Owned car since new. 
[Image: IMG_0291.jpg]

upload facebook picture

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#6
Thanks guys I'll have to wait and take a picture when I get home, also I'm changing cause I have a large amount of slop.i would consider a rebuild but I would really like to just swap it out instead of waiting for it to come back, lol
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#7
The slop could be the pitman arm and or the rag joint. Both of mine were worn out. I thought at first it was the steering box also. Wow, what a difference after I replaced them. The steering box was fine.

run_horse Run Horse Run!
John 72 Q Code
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#8
thanks jpaz ill check those first
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#9
toastintx,

I agree with 73pony. Most Saginaw variable ratio power steering was typical with the competition suspension option.


A new variable-ratio (15.7:1) power steering system was standard on the Boss 351, while a conventional fixed-ratio system could be had on other Mustangs.

Source: https://www.hemmings.com/magazine/hmn/20...04941.html

Another Source:

71 -72 Mustangs without the Competition Suspension used a Constant Ratio P/S gearbox listed as SPA-S and SPA-U.

http://429mustangcougarinfo.50megs.com/steering.htm

mustang7173
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#10
Anybody feel like posting their lock to lock amount of turns and what box they have?
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