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Old 05-11-2022, 08:58 PM
grd777 grd777 is offline
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Default correct front sway bar brackets and bushings

have these but not sure if the came off my 72 formula are they the correct ones
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Old 05-12-2022, 01:14 AM
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Pictured brackets came of a 1 1/4" front bar........which was standard on Trans am....and available (but uncommon ) on a Formula.

Those brackets use a socket head cap screw.....with a small diameter head for bracket side clearance.

The smaller 1 1/8" formula bar uses a wimpier looking bracket...with a standard hex bolt..

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Old 05-12-2022, 04:24 AM
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Quote:
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Pictured brackets came of a 1 1/4" front bar........which was standard on Trans am....and available (but uncommon ) on a Formula.

Those brackets use a socket head cap screw.....with a small diameter head for bracket side clearance.

The smaller 1 1/8" formula bar uses a wimpier looking bracket...with a standard hex bolt..
thanks for the info .can i use these on my car if i find the 1 1/4 sway bar

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Old 05-12-2022, 06:39 AM
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If you get the right bushings and bolts..

I think Moog used to offer correct replacement ones..

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Old 05-12-2022, 04:36 PM
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The brackets shown are for Y-99 as Green Hornet said.
Even with correct bolts there are 2 issues.
The imbeded " nut" in the subframe is Not that strong and
Can rip out as bars get bigger. The second is the bolt head on the factory Allen head bolts does Not cover much area and I have seen the mounting plate try to pull out around them.
I like to weld the nut,or new well nut, to the frame in all 4 locations, then use a washer on that Allen headed bolt. The rubbers were available for GM 3/4 ton trucks as I recall.
Anyways Don't tighten the thing up so it doesn't move, grease it so it works before the links are installed

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Old 05-12-2022, 04:39 PM
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Quote:
Originally Posted by Formulabruce View Post
The brackets shown are for Y-99 as Green Hornet said.
Even with correct bolts there are 2 issues.
The imbeded " nut" in the subframe is Not that strong and
Can rip out as bars get bigger. The second is the bolt head on the factory Allen head bolts does Not cover much area and I have seen the mounting plate try to pull out around them.
I like to weld the nut,or new well nut, to the frame in all 4 locations, then use a washer on that Allen headed bolt. The rubbers were available for GM 3/4 ton trucks as I recall.
Anyways Don't tighten the thing up so it doesn't move, grease it so it works before the links are installed
What do these bolts look like

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Old 05-12-2022, 07:51 PM
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Quote:
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What do these bolts look like
can i used these ,i have a 1 inch sway bar
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Old 05-12-2022, 09:16 PM
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Quote:
Originally Posted by grd777 View Post
What do these bolts look like
Grade 5 black phosphate Allen cap screws. I use a washer with them though.

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Old 05-12-2022, 09:17 PM
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Quote:
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can i used these ,i have a 1 inch sway bar
yes you can with correct rubber for your bar. These used a regular bolt.

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Old 05-12-2022, 09:19 PM
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Quote:
Originally Posted by Formulabruce View Post
yes you can with correct rubber for your bar. These used a regular bolt.
thanks for your help

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Old 05-12-2022, 10:27 PM
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In later years, which might not apply here, the larger bars needed the smaller head bolts for clearance and were very similar to the flange head bolts for manifolds and headers for where access is restricted. The largest washer that fits is still good. I think my front bar now uses leftover ARP header bolts I had.

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Old 05-13-2022, 02:14 PM
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There are actually two different frame part numbers. One is for the normal sway bar and the other is for the heavy sway bar.

The normal subframe sway bar holes are pierced then tapped. This is cheap but the threads can pull out under heavy force.

The heavy duty subframes had holes drilled in the frame and a riv-nut was installed in the holes. The riv-nuts have an external knurl on their body and deform both diametrically and along their major axis trapping and locking them into the hole. Kinda like a big rivet but with a tapped center. These are significantly stronger that the pierced tapped version.

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Old 05-14-2022, 07:30 AM
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Quote:
Originally Posted by Trevor78 View Post
In later years, which might not apply here, the larger bars needed the smaller head bolts for clearance and were very similar to the flange head bolts for manifolds and headers for where access is restricted. The largest washer that fits is still good. I think my front bar now uses leftover ARP header bolts I had.
What was the clearance need for

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Old 05-14-2022, 07:48 AM
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Quote:
Originally Posted by grd777 View Post
What was the clearance need for
Larger bar required a larger bushing...which put bushing retainer too close to hex bolt head...

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Old 05-14-2022, 07:57 AM
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Quote:
Originally Posted by Green Hornet View Post
Larger bar required a larger bushing...which put bushing retainer too close to hex bolt head...
Yes that is the problem I had. Going to try to put my old one back

  #16  
Old 05-14-2022, 08:15 AM
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Try your local hardware store True Value...or Ace....

You want a 3/8" x 1'...or 1 1/4"...NC socket cap screw......

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