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#1047143 - 01/15/17 12:16 AM Axle off center  
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joesmonteSS Offline
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Silver Creek, NY
I've searched for many hours on this subject but didn't find any specific answers. The rear axle on my car is off center by about 3/4" to the drivers side. I've read that adjustable upper control arms will help Center it but I can't find how much they will allow the axle to move.

Does anyone know how much adjustment I can get? Also, what arms should I choose? I'm looking at the Spohn adjustable uppers with the ball rod end.

#1047146 - 01/15/17 12:34 AM Re: Axle off center [Re: joesmonteSS]  
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SSLance Offline
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Peoria, AZ
Check out the UMI upper arms double adjustable with roto-joints... They'll give you plenty of adjustment to square the axle in the frame.


Lance
1985 Monte Carlo SS Street Car
#1047147 - 01/15/17 12:36 AM Re: Axle off center [Re: joesmonteSS]  
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SSLance Offline
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Peoria, AZ


Lance
1985 Monte Carlo SS Street Car
#1047148 - 01/15/17 01:02 AM Re: Axle off center [Re: joesmonteSS]  
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joesmonteSS Offline
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Silver Creek, NY
Yeah I looked at those also, they have some good stuff. I have their control arms on my s10. What's the difference between the roto joint and spohns ball end?

http://www.spohn.net/shop/1978-1987-GM-G...d=1#description


How much adjustment can you get side to side? Over an inch?

#1047155 - 01/15/17 03:54 AM Re: Axle off center [Re: joesmonteSS]  
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SSLance Offline
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Not familiar with the Spohn ball ends so can't compare. I know the Roto Joints on my UMI uppers and lowers have held up great with all of the abuse I have put mine through the past 4 years.

It really doesn't take much adjustment on the upper arms to move the housing over, there should be way more than enough adjustment to center any axle. Don't forget you can also use the uppers to set the pinion angle.


Lance
1985 Monte Carlo SS Street Car
#1047156 - 01/15/17 05:18 AM Re: Axle off center [Re: joesmonteSS]  
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mmc427ss Offline
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Pottstown, Pa
Everyone is using the Roto-joint, Spohn, UMI, Currie . Even the Edel UCA I bought 15 years ago have them. It's a great joint, almost zero maintenance.

Joe, don't you have a stock 12 bolt modified for a G?

I would think you may run into a few geometry changes with one UCA much longer than the other, and you need to compensate for that when you adjust the LCA to correct thrust angle. You would end up with two pairs of unequal length arms. Just think 3/4", moving rear 3/8" to center, is a lot. Lets see, something like 1" difference in UCA new length side to when done. Could be wrong about that, but.
Bob

#1047160 - 01/15/17 11:11 AM Re: Axle off center [Re: joesmonteSS]  
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joesmonteSS Offline
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Silver Creek, NY
No I have the stock 10 bolt in the car. Thanks for the info guys, time to order the upper arms!

#1047162 - 01/15/17 03:40 PM Re: Axle off center [Re: joesmonteSS]  
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upflying Offline
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Maybe you should find out why the axle is off before you upgrade to adjustable control arms? Are the stock control arms tweaked or is the frame bent?

Last edited by upflying; 01/15/17 03:42 PM.

86 MCSS Notchback coupe, LS3, 4L65E, QP 9", Eaton Truetrac, 4 wheel disc, column shift, Dakota Digital, silver with maroon bench interior

#1047163 - 01/15/17 04:18 PM Re: Axle off center [Re: joesmonteSS]  
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SSLance Offline
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Peoria, AZ
also, how are the bushings currently in the arms and housing?


Lance
1985 Monte Carlo SS Street Car
#1047164 - 01/15/17 04:50 PM Re: Axle off center [Re: joesmonteSS]  
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Monte_ExpreSS Offline
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Theres also a very good chance the body isnt sitting square on the frame, giving the illusion of the rear being offset. Wouldnt be the first gbody built that way

#1047167 - 01/15/17 05:38 PM Re: Axle off center [Re: joesmonteSS]  
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joesmonteSS Offline
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Silver Creek, NY
I checked the frame and measured from the points the collision guide calls for and the frame is square. The passenger side 1/4 was hit at some point but I don't know how bad it was. I've replaced all the stock bushings already and didn't see any bend or twist in the arms. I've read about the body not being centered on the frame but I can't move the body over because the passenger side frame horn is just about touching the inside of the 1/4 where the bumper bracket is. Eventually the body is coming off the frame for a full restoration and I will make sure I square the body up on the frame then.

#1047168 - 01/15/17 05:47 PM Re: Axle off center [Re: joesmonteSS]  
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mmc427ss Offline
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Checking body to frame alignment is easy, provided nothing is bent.
Just in front of the #7 right body mount is an alignment hole in the frame and the body. Visually or with a steel rod you can see how close they are to aligning. Mine was off 1/8" to the right, not a big deal.
At #2 left bushing is the primary alignment location. A 5/8" steel rod passes through the frame into the #2 body mount. This aligns the firewall left to right, and the body front to rear.
Now the #7 right location alignment holes will show if the body is parallel to the frame.
Bob

#1047670 - 01/30/17 10:42 PM Re: Axle off center [Re: joesmonteSS]  
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SSDenny Offline
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I have 2 87 montes and both have the bodies sitting about an inch to the drivers side, this makes both cars look like the rears are sitting to far to the passenger side.


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