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NCC Forum Home Page -> NCC - General Discussion -> Rear Diff and rear upper control arm bushing questions
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SShink


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Rear Diff and rear upper control arm bushing questions
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What type of bushings do y'all use in the differential ears and rear upper control arms? 

I've heard it's good to use rubber in the ears, and polyurethane in the upper control arms?

The ones in my diff are shot, and while in the area, thought I'd replace the ones in the upper rear controls arms as well.  I don't want a harsh ride though, so should maybe stay with stock rubber in the whole system?

Same bushing question for the rear lower control arms, as those are next in line so that I can add the factory rear sway bar I have on the shelf.  Need to box the arms first though.

 

 

 



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hkgmillette


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I have polyurethane in both. I have nothing to compare it to, so I can not tell you if the ride changed. The fronts are still stock rubber type.

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Hankster

Columbus, MN

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Bobs_Place


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I started out with all rubber bushings, than swapped the axle with urethane installed in the ears, later I installed a set of lower control arms with urethane. I was also very concerned with ride quality,  but did not notice any difference when I made the change, as I recall however I don't think the upper foreword control arm bushings were ever changed to urethane.

I think the urethane body bushings would cause more of a harsh ride. I installed rubber body bushing, they are made from a harder rubber howeve, but I'm very pleased with how little road noise I get.



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Bob W.

Lino Lakes
jim larson


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I put rubber in both front and rear control arms.  Also new rubber body mounts.  Bias tires made the ride uncomfortable @any thing over 50 mph.  The change to radials sure made a difference.  Then a change of steering ratio was a big positive. Then I added a rear sway bar and boxed the lower arms. And finally a change to a trans am 1 1/4 front sway bar. Rides and handles great.  Now I just have to get the air up and running.



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Jim L

Lake City
Lost in the 60s


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My rear control arms are all urethane with rubber in the diff ears. The ride was fine for me and no wheel hop. I do have an F41 rear sway bar too.

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Mitch D.   River Falls, WI

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John D


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Blackie's running "Poly-Graphite" bushings all around (on the rear) from PST. For all purposes, they're somewhere between pure urethane and rubber in stiffness/compliance. Only downside is after 10 years they're starting to squeak a bit... nothing a few hours unbolting one end at a time and smearing some silicone grease in there wouldn't fix.

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