Jump to content

Power steering box


Recommended Posts

Has anyone changed the box without removing the header? I really don't want to get into removing parts that are not required to be removed. Car is a 71 Mach 1 with 351C with a TKO 600 hydraulic clutch setup, so no zbar  to deal with.

  • Like 1
Link to comment
Share on other sites

Hi - I'm thinking of renewing my box also :whistling:-- but I believe ( may be wrong here :classic_blush:    ) that there are many different types/ratios. So very interested in this topic -- hopefully an ex-spurt will drive by soon 

Edited by 1sostatic

sig2.jpg

Enjoy's searching out 71-73 history

Link to comment
Share on other sites

2 hours ago, 1sostatic said:

Hi - I'm thinking of renewing my box also :whistling:-- but I believe ( may be wrong here :classic_blush:    ) that there are many different types/ratios. So very interested in this topic -- hopefully an ex-spurt will drive by soon 

No "ex-spurt", but yes, there are different ratios. A used PS box will almost certainly need a rebuild which is doable if you have the tools and the mechanical background to do it. There have been several threads on this by different members, Bentwork and myself included. Check the tag ID on your PS box. If it's a V/R, I'd look at rebuilding it first. These are heavy and shipping will be expensive.

A variable ratio SPA-T or V (71-73) or SPA-AD or AF (after 1/2/73). V/R boxes are 16:1 to 13:1 is what you'd be looking for imo. Another maybe better alternative is to buy an upgraded box with 12.7:1 fast ratio.  There are a few companies that offer these. Others can likely suggest the best one. While at it, definitely look at replacing the idler arm bushing or entire idler arm as well as the pitman arm. Other worn parts should be replaced at the same time if it were me. Ask for brand suggestions like Moog or Rare Parts. No cheapo Chinese stuff. 

More later if you need assistance.

Edited by Stanglover
  • Like 1

Geoff.

 I learn something new every day!

Link to comment
Share on other sites

Adding to the above post, I forgot to add the 17.5:1 fixed ratio box tags generally used on non Mach 1's 

SPA-S or U or SPA-AD or AF after 1/2/73.

Manual box tags; SMA-R = 22:1 1971, SMA-T =24:1 1972/73 or SMA-AC or AE >1/2/73

Edited by Stanglover

Geoff.

 I learn something new every day!

Link to comment
Share on other sites

On 7/26/2021 at 4:16 AM, Tnfastbk said:

Has anyone changed the box without removing the header? I really don't want to get into removing parts that are not required to be removed. Car is a 71 Mach 1 with 351C with a TKO 600 hydraulic clutch setup, so no zbar  to deal with.

I have shorty headers and can drop the box out the bottom.

F0770B50-CD0D-4EFC-BB4B-7055DB48BEE9.thumb.jpeg.c8aa1068c76a2614078005ad9c0e05c8.jpeg

 

For 1sostatic…

 

  • Like 1
Link to comment
Share on other sites

Turns out with my long tube headers the answer is no. It liked about an 1/8th of an inch no matter how you turned it. So ended up loosening the header to get the box out. I took the header completely off after the fact. New box will be here Tuesday.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...