Car gets twitchy on bumpy roads

[DrFtKiNg180sx]

Alright, I have a 1990 S13 Hb and while im driving on a bumpy road, the rear end of the car feels like its swaying back and forth and I get a little worried the car is gonna lose control. Yea, its that bad. Im not sure what the problem is because Iv'e never had this problem before. Can it be worn out bushings, loose bolts on the control arms or what? please help. O yea, the shocks arnt blown cause I just got a set KYB AGX's but im still running on stock springs.

[corn322]

How are your subframe bushings? Chances are those are the problem.

[DrFtKiNg180sx]

Hmmm, never checked those yet. How can I tell if theyre worn out?

[positron1]

Alright, I have a 1990 S13 Hb and while im driving on a bumpy road, the rear end of the car feels like its swaying back and forth and I get a little worried the car is gonna lose control. Yea, its that bad. Im not sure what the problem is because Iv'e never had this problem before. Can it be worn out bushings, loose bolts on the control arms or what? please help. O yea, the shocks arnt blown cause I just got a set KYB AGX's but im still running on stock springs.

Same problem here. Shimmy in the back when I hit a bump. WTF???

[naed240sx]

Hmmm, never checked those yet. How can I tell if theyre worn out?

Put on some SPL subframe spacers. Even if yours are not worn out, they are still worthwhile handling mods. They will most likely fix your problem though.

[tamdo714]

is it the blue ones on this page? thanks just want to make sure.http://splparts.com/Parts/Z32/...t.asp

[naed240sx]

yessir

[AZhitman]

*sigh*

Before you go throwing parts at it, get a 4-wheel alignment. This is a certain sign of improper rear toe, a common "outta-whack" item on the S-chassis.

Simple adjustment and the tail will feel solid and planted.

Subframe bushings aren't a bad idea after that.