New part for the backend - FF RSB

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Joeycurl

‘72 Demon 440
Joined
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Just wanted to share that I finally got my RSB from Firm Feel
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Can’t wait to install it. Although I have to ask… do we absolutely need grade 8 bolts for the shackles? new U bolts too?. Also do I need to get an alignment after installing the RSB?

anyone have experience installing FF RSB?
 
Just so you know, you are NOT charged by the letter here. You can fully write out all the words.

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No alignment is needed. Whoever suggests that is an idiot.
Grade 8 may be needed for competition but otherwise, grade 5 is fine for general street driving.
Firm Feel makes great stuff. Follow their instructions and you'll be pleased.
 
Joeycurl said:
do we absolutely need grade 8 bolts for the shackles? new U bolts too?. Also do I need to get an alignment after installing the RSB
Click to expand...

Grade 8 wont hurt anything.

New U bolts??? Do you remove the U bolts to the leaf springs to install? If not i see no reason to touch the U bolts. Just make sure they are torqued to SPEC.

DO NOT OVER TIGHTEN ANY U BOLTS AROUND THE AXEL TUBE, YOU CAN CRUSH THE TUBE. I have an 8 3/4 housing to prove it. AND somewhere in the FSM it notes the same. If the kit comes with U bolts to bolt it to the housing and they are NOT flattened in the bottom of the U, I would buy some that were flattened. A lot of psi in the tiny contact patch a round U bolt makes with the housing tube.

No alignment needed unless you remove the rear U bolts and the locating holes in the spring perch are elongated. Even then the amount of change will probably be negligable.
 
looks like I will have to remove the U bolts in order to get the sway bar end link plates in the right position. see below. sits between the springs and axle housing
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What's the torque spec on the U Bolt?
 
thought i was going to be able to install the sway bar this weekend but didn't happen. Just wanted to make sure I got the step sequence right
1. lift rear end and support at frame rails, both sides
2. Loosen U bolts and use jack to lower and support rear axle
3. Install sway bar bracket and replace U Bolts (torque 45 ft/lb)
4. Reverse order
5. Enjoy supreme handling

Did i miss anything?
 
I assume the bar itself is mounted to the body in some fashion?
 
Final update. I got everything mounted up. More work than I thought since I had the move brake lines and lower the fuel pump
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So far there’s a noticeable difference. I haven’t taken the car to push the limits so won’t really know until then.
 
I have the full FF front and rear suspension kit in my car 72 duster. It is night and day better than before replaced. So much less body roll in the turns.

You have a front sway bar in the car, right?
 
The final torque on the u bolts needs to be done with the weight on the tires.
 
Scody21 said:
I have the full FF front and rear suspension kit in my car 72 duster. It is night and day better than before replaced. So much less body roll in the turns.

You have a front sway bar in the car, right?
Click to expand...
I found a neat " surprise " when I did my rear spring and hanger bushings, when someone else adds SS style springs, and you go in a turn, when you come outta said turn, said A Body kinda " slams" down, it means the Previous owner, left short shocks.....I also, Personally, by my own doing, found, over tightening the front sway bay to K bolts, will give you " hang ups"
 
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