Rear Control Arms

M

mikester

G-Body Guru
Mar 10, 2010
865
562
93
Small town NY
#1
Ive got my wagon up on stands and Im getting ready to yank the rear out. Ive been looking at the different options as far as control arms. Leaning towards the UMI non adjustable tubulars since its for the wagon and Im not going to be beating the crap out of it.
What about the extra reinforcement bars ? I have them in my coupe but thats all Hotchkis. Should I bother ? I see the UMI reinforcement bars are adjustable. Should I look for a non adjustable set instead ? Whats everyone think ?
You folks always have good advice.
 
melloelky

melloelky

G-Body Guru
Oct 22, 2017
714
585
93
mass
#2
you're on the rite track,if you're not concerned about changing pinion angle then stick with the non-adjustable arms.keeping it simple is best..everyone's different,i think any time you can triangulate something it'll make it stronger,i think the only reason those braces are adjustable is to compensate for "manufacturing tolerances" between chassis'/fitment etc.i can't imagine they're adjustable to introduce a large amount of pre-load into that section of chassis.my .02 i like them
 
4

403Olds

Master Mechanic
May 31, 2014
278
51
28
South Central Ohio
#3
I’ve put the non-adjustable in two cars, I haven’t seen a downside to them.
 
fleming442

fleming442

Comic Book Super Hero
Dec 26, 2013
4,115
2,046
113
#5
I was under the impression that the upper frame mounts should remain flexible, either through the use of rod ends/roto joints or flimsy factory arms..... The Speedway arms look beefy in that area; how do they ride?
 
timo22

timo22

Master Mechanic
Supporting Member
Sep 10, 2012
437
495
93
St. Louis,Mo
#6
If you are looking for a less expensive solution , you might consider lower rear control arms out of a 2000 or so Camaro or Firebird. They are the same size as Gbodys and can be had pretty much rust free with 20 year newer bushings . A great candidate for boxing yourself..
timo22
 
Wraith

Wraith

Royal Smart Person
Jan 13, 2013
1,010
1,707
113
DFW, TX
#7
I was under the impression that the upper frame mounts should remain flexible, either through the use of rod ends/roto joints or flimsy factory arms..... The Speedway arms look beefy in that area; how do they ride?
I can't say how they ride, maybe in 2019 or 2020 lol. I did use roto joints from Speedway on the uppers though.
 
pontiacgp

pontiacgp

Canadian Prime Minister
Mar 31, 2006
23,752
4,366
113
Kitchener, Ontario
#8
I was under the impression that the upper frame mounts should remain flexible, either through the use of rod ends/roto joints or flimsy factory arms..... The Speedway arms look beefy in that area; how do they ride?
you are correct, here is an upper from a G body that we boxed just to see if it helped with lap times. The hole was a 1/2" round when we started....

binding-jpg.90725
 
M

mikester

G-Body Guru
Mar 10, 2010
865
562
93
Small town NY
#9
I think I'll just use the non adjustable tubular arms from UMI without the extra reinforcement bars. I didnt want the adjustable reinforcement bars to begin with and the four new arms will probably be an improvement over the originals anyway. I even considered buying the extra bars from BMR but since I need to spend a little more on parts I figured I'd just do without them.
 
Z

Zspoiler

Apprentice
Jun 3, 2018
85
30
18
#10
I have Hotchkiss non adjustable trailing arms on mu 1981 El Camino with now issues. There is a kit out there to box your stock ones for about $20.00 from Original Parts Group .For another option.
 

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