63 rear suspension issue,imput please!

[Stan E.]

My 63 has a problem in the right rear suspension. The car has 25 miles sence a PV and Duntov. 300hp,4 speed w/336 rear. When I accelerate the right rear of the body goes down and the left front pulls left. When decellerating the front stops pulling left and the right returns to level. It is all new w/ proper allignment and rearched orig.rear spring . It is DANGEROUS! No fun to drive . Any ideas? Thanks!

[Rich P.]

Re: 63 rear suspension issue,imput please!

Stan,

check the bolt and mount for the rt side rear crossmember.

Rich

[Stan E.]

Re: 63 rear suspension issue,imput please!

I'll check that out Rich. Thanks

[Stan E.]

Re: 63 rear suspension issue,imput please!

More info, please. Thanks

[Edward J.]

Re: 63 rear suspension issue,imput please!

Stan, is it possiable there is something going on with the rear posi, Maybe you need some additive in the axle. If one wheel is driving the car in rear this will happen, locked posi clutchs due to a set-up issue.

[Duke W.]

Re: 63 rear suspension issue,imput please!

You tell us the alignment is "proper", but how do we know? Who did it? What kind of equipment? What are the settings?

You can pay big bucks for an alignment on state-of-the-art equipment and get a bad job because the tech doesn't know what he's doing or doesn't care. I particular the rear toe could be messed up. It happens all the time and can have dire effects on handling.

"Rearched spring" raises a yellow flag. There is absolutely no reason to have a spring rearched. I think most of the time it just destroys the OE temper, which can lead to a broken leaf.

Check the rear ride height IAW with the shop manual and AIM. That may tell a story.

Also, tires could be an issue. Measure the circumference and swap them side-to-side to see if there is any difference. Circumference not within about a half-inch can cause pull with Positraction axles.

Duke

[Russ S.]

Re: 63 rear suspension issue,imput please!

Stan, I don't know if this could cause your problem but what about one or more bad shocks at these two corners? The only thing is, I don't know why it would pull even with a bad shock. Russ

[Timothy B.]

Re: 63 rear suspension issue,imput please!

Stan,

I would take the tire off and look at the sombaro where it welds to the frame. This is where the crossmember above the rear is installed to the frame via the rubber bushing on each side..

You may have to get a bar to see if the welds are broke.

[Gary B.]

Re: 63 rear suspension issue,imput please!

Did you do a frame off and was the frame solid? A rusted frame flexing in the kick up will cause the same problem. Otherwise it sounds like you have lost some alignment shims in the right side and the trailing arm is moving. This is common in 63s as the shims fall out.

[Stan E.]

Re: 63 rear suspension issue,imput please!

Frame good, allignment by long term man on late equipment, I'll check for cracked weld. Thanks guys!!

[Joe L.]

Re: 63 rear suspension issue,imput please!

Frame good, allignment by long term man on late equipment, I'll check for cracked weld. Thanks guys!!

Stan------


Did you thoroughly check the rear end crossmember cushions as Rich Pasqualone mentioned? Sometimes these can be hard to inspect and determine if they are broken, or not. If one is broken it can cause just about the conditions you describe.

[Jeffrey A.]

Re: 63 rear suspension issue,imput please!

Stan

I had the same issue with my 63 this past year and as Joe described to you is what happen to mine. My right side crossmember cushion was broken, I had know idea how it happen, it drive me crazy until I started taken things apart to find out it was broken. After I replaced the cushion, everything was fine.

[Joe L.]

Re: 63 rear suspension issue,imput please!

Stan

I had the same issue with my 63 this past year and as Joe described to you is what happen to mine. My right side crossmember cushion was broken, I had know idea how it happen, it drive me crazy until I started taken things apart to find out it was broken. After I replaced the cushion, everything was fine.

Jeff------


How did it happen? Well, when a car is 45 years old, a lot of parts that were originally installed on the car might be beyond their service life. Things like these cushions are life-limited components. True, they last a long time but that does not mean forever.

[Jeffrey A.]

Re: 63 rear suspension issue,imput please!

Joe, I have not idea how it happen, when i restored the car I did a frame on, which I should have done taken the car off the frame, it would had made life alot easier. At the end I just about did everything to the car expect taking it off the frame. I as explained, the one of my cushions was cracked and was original the other side was original and I ended up replacing both cushions because I did not want to deal with the issue agai, aleast not for some time.

[Joe L.]

Re: 63 rear suspension issue,imput please!

Joe, I have not idea how it happen, when i restored the car I did a frame on, which I should have done taken the car off the frame, it would had made life alot easier. At the end I just about did everything to the car expect taking it off the frame. I as explained, the one of my cushions was cracked and was original the other side was original and I ended up replacing both cushions because I did not want to deal with the issue agai, aleast not for some time.

Jeffrey------


With 2 new cushions I don't think you'll ever have to be concerned with doing this job again. At least, not on this car.