Hi Guys, i need some help- only new at this. i own a TJ sports- it has 18" Rims and has been lowered(not sure how low, but low enough). I have recently replaced 2 tyres, gone in for a major service etc. But i still have a problem with the car wanting to slip out from bumps in the roads. hope that makes sense. it kind of slips the opposite way im turning its quite scary and i dont know whats causing it. the springs have not been cut. i have been told to take it in for a wheel alignment. (havnt done it as yet) do you think there could be anything else causing this? i appreciate your help

Sounds like tramlining. This is when the car wants to follow particular ruts in the road. It happens when wide tyres are used and can be exacerbated by changing the suspension geometry. It is particularly evident in cars where wide tyres far beyond manufacturer specs are used. How wide are your tyres?

Thanks Dave. i dont know what the width is my the sizing on the tyre is 235/40Z R18 95W- whats the width is it the 95w? sorry i have no idea

Thanks Dave. i dont know what the width is my the sizing on the tyre is 235/40Z R18 95W- whats the width is it the 95w? sorry i have no idea

235 is the width in millimetres. That isnt over the top to be honest.

You may find things will improve after a wheel alignment. This isnt an expensive thing to do so that would be the first thing on your list. If its still bad after an alignment, get somewhere to do a health check on your suspension/front end components. Things such as worn bushes can also cause bad tramlining

FYI 95 is the load rating. This is an acceptable rating for a magna so no worries there

awesome. Thank you. ill get on to it :)

Check the the shock absorbers after that.

I would also suggest to start with the simplest thing like tyre air pressure. Few times when i had my tyres changed tyre places put in ridiculously high pressure, if this is the case it will contribute to your problem, for 235/40Z R18 pressure of 38 psi would be alright, go into any servo and check the pressure & adjust it to suit on all 4 wheels.

Thanks guys.. ur a great help

What type of type are they?

Standard height tyres have a lot of sidewall flex and when you go to wide 40 profile tyres with high pressure (and hence little sidewall flex) you can often suddenly show up problems in the front end like a bad wheel alignment, or worn components like bushes, tie rods, tie rod ends and ball joints. If the car has high km, I'd go over the front end and look for worn bits very carefully.
Tramlining makes the car very non-relaxing to drive. If you find a road that does it badly, try putting the standard wheels/tyres back on the front and try it again. If there is a big difference you know there is something in the front end that doesn't like working with the 235 X 40 tyres.

honestly everything you have said its doing will be fixed by a wheel alighment get it in asap as you will be wearing your tyres pretty fast sounds like the toe is out alot and probably the camber alot of people do home lowering jobs and dont think it need a alighnment the $60 will be well spent

i had this problem with standard height suspension on my TJ, after lowering its exactly the same - no change in behaviour from what i can tell
does the car almost feel like it wants to skip/slide away from the corner? assume this only happens on bumpy corners? if you are in sydney - i get it every morning driving the corner from southbound pacific highway onto the Lanecove tunnel through that little hairpin corner/ merging lane mess.

there is a slight bump/ridge in the road going across the road and as i hit it turning the corner the car feels like it wants to skip away into the wall... faster = worse, slower = better
*should really think about going a different way :D*

Sounds like it might be tracking slightly..

What's the wheel alignment say about the toe..?

SuFz