Shake from rear on highway primarily between 61-78

[tyb323]

CV joints are all freshly regreased, inspected, reinstalled and tight, so it ain't them

[Ryan King]

Mine used to have a horrible wobble at fast Highway speeds. I am still working on tracking down the problem as we speak. I am going to do an overhaul of my steering rack along with with adjustable lower links on the rear.

I believe the awful wobble is caused by the car being out of alignment.

[tyb323]

Aligned less than a week ago

[jawn101]

Did it wobble before the alignment? Maybe it was done wrong or you lost a shim off a rear wheel. I have read that the universal shims used at big box shops tend to fall out for some reason and that you are well advised to bring along some proper ones from a vendor.

[tyb323]

Just jacked up the back wheels, no fore or aft movement on either one unfortunately. It did shake before alignment, no better after, and the guy used the proper shims. So still clueless

[shortcircuit971]

I just found a loose spot on my rear end that may sound like what you have as well. Not trying to hijack the thread, but it may be your solution too.

On my passenger rear wheel, the trailing arm has play at the two bolts securing it to the hub carrier. At the moment I have the struts out and am waiting for new shocks to arrive. With the spring tension off, when I lift the hub carrier up and down I can see the trailing arm move at the hub carrier bolts which makes a good clunk sound.

Now my question is, does this mean my trailing arm bolt holes are worn out, or will re-torquing the two bolts fix my problem? The bolts themselves don't move, just the trailing arm on the bolts, as if the holes of the trailing arm are bigger than the bolts going through them.

[Farrar]

Maybe need new bushings?

[David T]

Typically a bent or out-of-balance rear wheel will show up as a shake in your belly and be more noticeable at certain speeds. It can also be a defective tire and you wouldn't always be able to see it. Run your hands around the sidewalls, sometimes you can feel a bump where the cords have shifted or separated. If it is a front tire you usually feel it in the steering wheel, especially on a Delorean because it doesn't have power steering to isolate you as much from the tires. Raise the car and put a piece of wood alongside each tire. Slowly rotate it and see if it moves in and out. Make sure all of the tires have the proper pressure and all of the lugs were tightened in the proper sequence to the correct torque.
David Teitelbaum

[tyb323]

Finally figured out my issue the other day, bushings are bad on my front right upper control arm. Stiffening my entire front end apparently made it worse. Another suspension disassembly is in the near future =(

[Farrar]

Finally figured out my issue the other day, bushings are bad on my front right upper control arm. Stiffening my entire front end apparently made it worse. Another suspension disassembly is in the near future =(

Are you going to replace them with polyurethane or standard rubber?