[team5150]

Are the boxed rear lower control arms the same for 64 - 72 ? Or is there a different set for 64 -67 and 68 -72 ? The pair I have are 25" long end to end and 22" from bolt hole center to center.

Thanks !

 

[BillsCamino]

Basically. lowers are the same from '64-'72...uppers are different between '64-'67 and '68-'72 years.

 

[Hi-po SS 454]

64 to 72 lowers, check any parts venders cat.

 

[al carson]

Edelbrock upper arms are 1964-67
" lower arms are 1964-72

 

[Mali Blu]

Slightly off topic,But why go with boxed arms. Are the stock ones really that bad??

 

[BillsCamino]

Slightly off topic,But why go with boxed arms. Are the stock ones really that bad??

Can't really install a rear sway bar unless the lower control arms are boxed.

 

[Mali Blu]

Can't really install a rear sway bar unless the lower control arms are boxed.

Why??

 

[Keith Tedford]

If you drill the side of a standard arm and bolt on the sway bar, then the arm will eventually crack around the bolt holes. The shape of the boxing reinforcement is such that your bolts go right through the arm and out the other side spreading the stresses our so that cracking doesn't happen. Speaking from personal experience.

 

[Hi-po SS 454]

The stockers also flex quite a bit

 

[ACLineman]

Yup, I had BAD wheel hop, with open arms, Installed boxed and sway bar...... :thumbsup: No hop

 

[DZAUTO]

All the Chevelle vendors sell the inserts that are required to box stock non-boxed arms. Simply weld them in, you're good to go.

 

[Mali Blu]

O.K. Thanks.

 

[69boo307]

Or you can just buy some 1/8" steel and cut out your own inserts. I did that and made a nice set of boxed LCA's that I sold to another member here.

 

[team5150]

I have a pair of boxed ones for sale that are off a 70 SS and a guy that wanted to buy them said they wouldn't fit his 65.


Thanks for clearing this up.

 

[engineer]

the inserts do not fit inside all the arms, some are too narrow. also, sway bar ends came with 5.5 in and 6 in hole spacing. The inserts can be used with only one hole spacing, not the other, so be sure to do the correct hole spacing based on the sway bar first.

 

[mr 4 speed]

78-88 G bodies do not have boxed lowers from the factory with a sway bar.
I'm not saying not to box them,just an FYI

 

[PaulR]

I had a rear sway bar installed in my '70 with open LCA's for several years, and no problems. I just boxed them recently, since I was putting in the 454, the posi, the rear disc brakes and so on.