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Rear suspension wobble

R

RattleCanWonder

New member
Hey guys, bit of a question here. I've got an 06 Grand Prix and I just replaced all of my rear suspension minus the knuckles and subframe. Today I changed out the spindle rods and trailing arms, and now my tires screech while I drive, and I can shake the rear end pretty decently compared to the front just by pushing the car. I torqued the rear subframe to 80ftlbs, spindles to 103 at the frame and 110 at the knuckle. I feel like the car just shouldn't feel that loose. Can anyone offer and advice on where I went wrong? Things were tightened while in the air, could that be my problem?
 


Something must not be tight, be it the trailing arms or the lateral arms if you can move the rear tires around.

If you replaced the arms with the toe adjustment for the rear you will need a new alignment.
 
being your using the wrong terminology for most parts, im unsure whats been changed.

chances are you need an alignment pretty bad right now with a load of new parts installed.
 
My bad. The trailing arms, adjustable track bar, and fixed track bar were all replaced today. Also the tires themselves don't shake. More so the entire rear end of the vehicle
 
you need an alignment then. asap or kiss them new tires goodbye.

and all these cars will push back and fourth on the rear. it did it before, it does it now, you just never did it before today.
 
and iirc the trailing arms should be tq'ed on the ground full weight of the car on them. not sure if it really makes a difference or not. but they say thats how to do it.
 


That makes sense. I posted this still a bit shaken from the ride home from where I worked on it. I also just checked the Haynes manual for proper torque specs and the trailing arm to knuckle specs for an 05 are 52ftlbs, but for an 06 it's 177ftlbs??? Is that a typo? Because I only tightened mine to 52ftlbs
 
Hmm. Then I'm stumped. Could the wobbles and the screeching sound of tires being dragged be caused by the toe from the adjustable track bar? I adjusted them to the same length as the old ones, but now that I'm looking at my car, the 3 o'clock position of the tires definitely point outwards.
 


Scheduled for Wednesday. I can't be without the car tomorrow because I have to work. Good tires on the front. Older ones on the back, and it's getting two new ones after the alignment. Tire tread isn't so much my worry, as much as this thing falling apart on my way to work tomorrow.
 
if you get the tires at the same place as the alignment, they should put the new tires on first, then align it.

if not the same place, get new tires first.
 
Interesting. In the city I live in our roads are so terrible I'll probably knock the alignment off within the next 100 miles anyway, its more of a safety thing at this point.
 


For what it's worth, when my front end was way out of alignment (.05 degrees is technically spec, I had around .90 toe at both wheels) my tires would screech at random intervals. Almost always when turning tight at slow speeds. You'd be surprised what a bad alignment can do.
 
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