speedway motors boxed rear control arms

[L05edSS]

has anyone ever tried to put the 68-72 a-body supports in the lower bars? These are the bars I used in my 70. I have boxed many G-body arms, but you can buy that lower piece in the A-body arm and weld it in. Just wondered if that insert would fit a g-body arm.

JEGS 79373: Rear Lower Trailing Arms Fits Select 1964-1972 Chevrolet, Buick, Oldsmobile, Pontiac Models [Polyurethane Bushings] - JEGS

Get the Best Performance with JEGS Rear Lower Trailing Arms Fits Select 1964-1972 Chevrolet, Buick, Oldsmobile, Pontiac Models [Polyurethane Bushings] 79373 parts at JEGS. Shop Now at the Guaranteed Lowest Price!

www.jegs.com

prolly not cuz had a friend many yrs ago that took a 12 bolt out of a 70 chevelle and had to get special arms to fit in a 85 ss but heres this and speedway may have the answer for fitting polys.

https://www.speedwaymotors.com/Speedway-Stamped-GM-Metric-Lower-Rear-Control-Arm,88060.html

 

[bracketchev1221]

prolly not cuz had a friend many yrs ago that took a 12 bolt out of a 70 chevelle and had to get special arms to fit in a 85 ss but heres this and speedway may have the answer for fitting polys.

https://www.speedwaymotors.com/Speedway-Stamped-GM-Metric-Lower-Rear-Control-Arm,88060.html

No don’t pay attention to the bars. Look at the bottom picture of the a-body arms I listed. That reinforcement plate can be bought separate. Can that plate fit a g-body bar to box it

 

[scoti]

No don’t pay attention to the bars. Look at the bottom picture of the a-body arms I listed. That reinforcement plate can be bought separate. Can that plate fit a g-body bar to box it

If they're available separate, the plates for the Jeg's arms should work on the g-body spec arms as well. Worst case they might require some trimming if needed. I've boxed them (A & G-body) for people using some flat .125" steel strap from the hardware store

 

[doood]

If they're available separate, the plates for the Jeg's arms should work on the g-body spec arms as well. Worst case they might require some trimming if needed. I've boxed them (A & G-body) for people using some flat .125" steel strap from the hardware store

Looks stiff!

 

[scoti]

Looks stiff!

Definitely more than OE. I tried to sell him a new but unused set of Currie-Trac arms w/Johnny-Joints but this was for his sons high-school ride ('70 El Camino SS clone).
He did opt to utilize rubber bushings per my recommendation vs Poly units.

 

[bracketchev1221]

If they're available separate, the plates for the Jeg's arms should work on the g-body spec arms as well. Worst case they might require some trimming if needed. I've boxed them (A & G-body) for people using some flat .125" steel strap from the hardware store

That was how I did my 78 back in the early 90’s. Was asking about the other way after getting into the factory f-41 70 ss suspensions. The ones I had in the race car were boxed factory arms before I changed to SSM bars.

 

[L05edSS]

No don’t pay attention to the bars. Look at the bottom picture of the a-body arms I listed. That reinforcement plate can be bought separate. Can that plate fit a g-body bar to box it

No don’t pay attention to the bars. Look at the bottom picture of the a-body arms I listed. That reinforcement plate can be bought separate. Can that plate fit a g-body bar to box it

ok i see what you were sayin. IDK, i agree with posters below or above this reply. i tore up the internet lookin for stock replacements after having some in my cart and went BO hrs before i had 1st chance in months to order. just something to think bout. the price for the speedway boxed arms no bushings, about 150. the sugestion for ruber bushings were moogs forgot the # ut in my seaches here from older posts seen the same # pop up for factory replacements. not sure if that helps ya ut man the parts hunt is grueling when you can b uy already boxed arms. just read close in my above posts when comes to what found amazon in reviews.

i left a ? that went unanswered was basically theres no selection to pick A or G body so what am i gettin? est advice go to speedway & iron it out if you choose.

EDIT. when said tore up the net i meant it. i am punch bowl turd on YT, found this 4 yr old vid on yt and asked "how are they on the street after 4 yrs?" he replied next day, comment is there for all to see.

 

[403Olds]

I've done several vehicles just welding in plates on the bottom from the scrap pile. My Tahoe, for example doesn't have much aftermarket support, so that's about the only option to get rid of some of the flex.

 

[Ernest]

Good to know stuff.... one day i'd like to upgrade my suspension with tubular upper/lower control arms for the front and a boxed set for the rear.

I see people have complained about the polyureothane bushings not flexing or articulating enough over the OEM rubber type... but what about the polygraphite type?

 

[Rt Jam]

It's not complaining. Just an explanation for you yourself to make a decision on what is better.

An OEM rubber bushing has enough give in it where it can twist or rotate the control arm with the axle housing. A heim joint and a roto joint can do the same thing.

A poly can Not. The only way it can is when you force it. This is hard on the bolts, mounts and the arm itself, especially if you have "boxed" it.


3 pages later, I'm thinking, nobody gets it so here is a visual to explain.