Leaf Spring Mounting Boxes

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69XR7RestoMod
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Posts: 147
Joined: 21 Nov 2011, 21:41
Location: North Florida

Leaf Spring Mounting Boxes

#1

Post by 69XR7RestoMod » 07 Oct 2018, 13:17

Recently someone asked me if he could use his standard leaf spring mounting box with competition handling springs. I personally have done this and have not had any problems, but I thought I would put it out there to ask what you would do.

The box for "standard" suspension is 1/4" shorter than the "competition handling" or GT box. So when you put the thicker springs on, and go to tighten everything back up, there is a gap of 1/4" between the box and the shock mounting plate.

https://secure.cougarpartscatalog.com/s ... attribs=87

Since the deeper boxes for competition handling don't seem to be readily available, it seems the only options are to live with the gap (as I have done) or add a 1/4" thick spacer to make up the difference.

Any of you had the same experience?
1969 XR-7 Restomod 408ci 483HP/523TQ, FiTech, TKO-600

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cj750
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Joined: 26 Nov 2011, 19:42
Location: Siloam Springs, Arkansas

Re: Leaf Spring Mounting Boxes

#2

Post by cj750 » 07 Oct 2018, 22:09

I don't have an answer for you, but thanks to your post I learned or the first time that there were different spring clamp boxes. I've accumulated several, but I've always considered them interchangeable. Now I'm going to have to look and see which ones I've got.
Every post I make comes with a request for corrections. I'm here to learn.

1969 Cougar Eliminator 351 4V, yellow
1970 Cougar Eliminator 428SCJ, black

69XR7RestoMod
Registered Member
Posts: 147
Joined: 21 Nov 2011, 21:41
Location: North Florida

Re: Leaf Spring Mounting Boxes

#3

Post by 69XR7RestoMod » 08 Oct 2018, 15:21

I've been wrenching on cars and cougars in specific since the late 70's and only learned about the different boxes a few months ago. My guess is that over the years many people have "upgraded" to competition handling springs using their "standard" boxes and probably didn't even notice the extra 1/4" gap.
1969 XR-7 Restomod 408ci 483HP/523TQ, FiTech, TKO-600

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