Cobra pulls to the right on acceleration

[Chilibit]

I had a left rear wheel bearing that was bad and allowed the assembly to move. It pulled left under acceleration. Even mild acceleration.

[Dwight]

It sounds like your right rear tire is getting more traction than the left. When you accelerate the rear end torques clockwise, if your looking from the rear of the car. This applies more force on the right rear. You would think with the weight of the driver it would equalities the force on both tires. It does not. If you can adjust your rear shocks, increase on the right and decrease on the left. You can play with the tire pressure but it hard to keep it where you want it. The change in tire temperature and weather will change the tire pressure. I had to install adjustable coil overs to cure mine. Soften the spring load on the drivers side and increase the spring load on the other side. You're shifting some of the power from the left wheel to the drivers side. To much and you will pull to the right.

Dwight

[Ronbo]

Sounds like one (or more) of the rear bushings has softened up and is deflecting under load. This could be either side depending on if it's the front or rear bushing. I guessing you have bushings instead of sperical joints since you list your cars as CSX's.

As Tom stated alignment could also be an issue, another remote possibility is the differential slipping on one side (you'd probably feel this as chatter though). Do you notice any clunks, shudders or other noises from the rear (granted these are rather hard to hear over the pipes and complaining tires)?

Easiest thing to do is get under there with a big pry bar and start tugging on stuff and see what's giving in, also look for bushing material squeezing out.

Dwight, what your describing affects solid axle rears, not independent.

[gthompson]

Thanks for everyone’s input on this. The car has 130 miles on it is a CSX car with adjustable shocks, the adjusting nut is 18 threads up from the bottom on both sides.

The tires are new GoodYear Billboard and they are the same size on both sides. I am running 26.5 psi on all four tires (not sure if that is the right pressure for Billboards?).

The rear wheel lower adjusting arm (toe in/toe out?) that moves the wheels left or right are tight and the same distance on both sides. The rear wheel top adjusting nut (camber/caster?) are 8 threads out on both sides.

The car drives straight maintaining my speed. The car pulls to the right when under moderate to heavy acceleration (even accelerating from 60 mph) with out wheel slippage. then the car comes back to the left when you lift on the throttle.

[Buzz]

If you hold a steady speed in a lower gear (2nd or 3rd) and suddenly lift off the throttle, does the car pull to the left? If it does then there is surely an issue with the rear suspension geometry changing due to worn or loose components. If it does not pull on sudden deceleration and only pulls on acceleration, then I would guess that it's either a problem with a defective limited slip differential or an out of spec rear tire diameter (larger diameter on the left rear).