Frame sag

427carl · A Poncho Legend!

Frame sag

66 ponchoboy · Veteran Member

I took my Big Block Pontiac in for a wheel alignment and the mechanic said that the frame had sagged, bent due to the weight of the engine. Is this a common occurence? I read somewhere that youcan buy upper A Frame bushing that will help put the mounts back in specification. Any experience or answers out there?

67Poncho · Uber Guru

How is he doing the alignment for camber? Is he adding shims to the upper control arms or adjusting the lower control arm cams like he should be properly?

2drpost · Uber Guru

yep, if there's no adjustment left in the lwr arm cam, moog makes offset upper arm shafts.....

http://www.moog-suspension-parts.com/proddetail.asp?prod=MOOG-K6104

4SPEED427 · A Poncho Legend!

I have used those offset shafts with success.

crazyj · Poncho Master!

Frame sag is common especially on the sub-frame cars like the early Camaro's or Nova's. I had to fix a few when I had a frame rack. Basically tie down the rails and jack up on the front cross member, not a whole lot to it. On a full frame car I would make sure the frame isn't rusted out.

Crazy J

mr409 · Addicted!

Find a mechanic that knows what he's doing and works on old cars not new cars.

crazyj · Poncho Master!

mr409 wrote:
Find a mechanic that knows what he's doing and works on old cars not new cars.

I had a proper frame machine with guages when I did this. I agree with mr409, unless you know what your doing don't try this at home boy's and girl's.

CDN2PLS2 · Uber Guru

Yup,not uncommon.

66 ponchoboy · Veteran Member

Thanks Guys the mechanic said he took out all the shims in the I think upper control arm and had no adjustment left. He had it on a hoistbut that doest mean too much eh. I've ordered the Moog parts thanks to the web address from 2drpost. I have Poly bushings and will replace all rubber anyways..