GM A body rear lower control arms

[elesquan]

I am looking into getting performance rear lower control arms, and am interested in units with spherical joints on both ends.
My questions is, will using these style LCA's allow a lot more side to side movement without a panhard bar?
If any of you have used these style bars in road race or autocross, I would love to hear what you think of them.

Thank you!
Bruce

[killer69]

No the triangulation takes car of that. you can't use a pan hard bar with a triangulated 4 link

[elesquan]

Thank you Blake!
I knew the triangulation is what took care of that movement with the stock bushings in place, but was apprehensive about this still working properly with spherical joints.

From the picture on speed tech web site, the rear LCA's used in the kit for the A body look like they have poly bushings. I did not read the information indicating they are Delrin and can articulate, so I was not considering the speed tech product.
Can the LCA's be purchased separately, or only with the full kit?

[killer69]

we really only sell the uppers and lowers together as that is how we build them in sets.

[Carl @ Chassisworks]

The pivot ball style is probably our most popular A-body arm right now. You can find them on our site here: http://www.cachassisworks.com/c-334-control-arms-by-vehicle.aspx

This is part number 5826-A10 and fits 64-72 A-Bodies. We make the entire assembly in house, except the nuts and bolts, so everything fits together extremely well. You can purchase pairs in any combination you prefer.

https://static1.pt-content.com/images/pt/2013/08/5826a10_1_-1.jpg https://static1.pt-content.com/images/pt/2013/08/5826a10_2_-1.jpg

There's a set on Russell Wells GTO. This car.
https://static1.pt-content.com/images/noimg.gif

[UMI Tech]

I am looking into getting performance rear lower control arms, and am interested in units with spherical joints on both ends.
My questions is, will using these style LCA's allow a lot more side to side movement without a panhard bar?
If any of you have used these style bars in road race or autocross, I would love to hear what you think of them.

Thank you!
Bruce

Hey Bruce.

We have a Roto-Joint kit with all street/race worthy Pro-Tour stuff as well.

http://umiperformance.com/catalog/index.php?main_page=product_info&cPath=2_32_42&products_id=781

And as mentioned before, the converging 4-link uppers take care of the lateral axle location. You'd be amazed how little side to side movement there is with a Roto-Joint style rear system. The Roto's, do however, allow the rear to articulate all the way into the wheel house on one side while being in full droop on the other. It flops around like a rag doll in the intended plane and is located nicely in the other.

ramey

[joejbal]

Ramey, the roto joint is rebuild able, but where are the components on your site?

[Barrrf]

Whats is the benefit of the pivot ball/roto joint over regular bushings? Less binding during articulation?

Also, my car exhibits some torque steer. I suspect frame twist is the issue no? Or axle not being centered? If axle isnt centered, would adjustable rear control arms be the cure?

[UMI Tech]

Ramey, the roto joint is rebuild able, but where are the components on your site?

Here is the Roto-Joint page: http://umiperformance.com/catalog/index.php?main_page=roto_joint

Here is what you can order: http://umiperformance.com/catalog/index.php?main_page=index&cPath=199

Of course if you have any specific questions I'm happy to help on here or at [email protected]

thx

ramey

[UMI Tech]

Whats is the benefit of the pivot ball/roto joint over regular bushings? Less binding during articulation?

Also, my car exhibits some torque steer. I suspect frame twist is the issue no? Or axle not being centered? If axle isnt centered, would adjustable rear control arms be the cure?

Yup, less binding during articulation. The Roto-Joint acts like a rod end but with some cushioning.The Roto-Joint is built entirely in-house and the liner is Delrin.

[joejbal]

Ramey, I don't see any of the parts for sale to rebuild the joint.

[UMI Tech]

Ramey, I don't see any of the parts for sale to rebuild the joint.

Good morning.

They aren't on the site individually. You can call to order. The Delrin inserts are $2.99 each and each end requires Qty 2.

Of the thousands of Roto-Joints we sell per year I bet we sell about 20 rebuild pieces. The Delrin is very tough and the Roto-Joint is bulletproof...

ramey

[joejbal]

Ahh, thanks.

[raustinss]

I may have a set uppers and lowers from UMI for sale, brand new....with adjustable braces.

[SD455]

I may have a set uppers and lowers from UMI for sale, brand new....with adjustable braces.


Interested if still available.

[UMI Tech]

UMI New Year's Sale is on now if you're looking for some savings on really good stuff.

ramey