I couldn't pick a title, but I just put new tires on yesterday, they have less than 50 miles on them.
255-40-17 in front and 275-40-17 in the rear. I went by American Muscle recommended size chart.
I have Cobra R 17x9 rims all around.
I had 245-45-17 on there before, but didn't have a problem until with the new tires.
They're Toyo Proxes 4 by the way, for old and new set of tires.

Problem: Didn't happen with the other tires, but with the new tires it's happening.
I love the traction, like how much it's gripping and holding down. But when you go to turn, change lanes, move the steering wheel back and fourth. Anything that pretty much consist of the rear end moving left to right. It will try to break use, mess with it harder it will completely let go and spin (almost happened).
I am pretty sure the Tire PSI is at 36, but not completely sure since a Tire Place did it.

The only thing I can think of is my shocks are bad, like gone. They have been like this with the other tires as well which are like bold. I can understand them being the tires kind of, but at the same time I can't see that being the problem. Considering the old tires didn't do it.
I can upload pictures if needed, hopefully I explained it well enough. I'm kind of ranting, to much bull**** going on and this isn't helping. I do not want to spin out if I turn to fast and get in a wreck or whatever.

 

I guess my driving side rear trailingarm is out of place.

Thanks for the reply ********. LoL just playing.

 

this is meant to be helpful only, please don't take it any other way.

when you post it seems to be in some language (maybe biker/skaterese) that many guys don't seem to understand very well.

if you would try to work on your english/car language skills you might get more help. it's not that people don't want to help, it's just that they don't know how based on your posts and because of the "language barrier."

seriously, just tring to help out. not intended to be disrespectful in any way.

 

I kind of figured that.

 

that was good for a chuckle at least.

did you make any other changes before the problem started?

 

Only thing I've done recently is got new tires on, that's it. We think it was just random timing that this happened. I can't spell the other word that is proper.

 

couple more questions. what makes you suspect the trailing arm? (more commonly known on mustangs as a lower control arm, but trailing arm will work)

how old are your shocks and are they original equipment? stock mustang shocks are known for not lasting long. i replaced mine when i lowered my 04. had 22k miles and one of the rear shocks was completely dead and the other rear and both fronts seemed to be well on their way.

check this stuff and maybe a smarter guy will chime in as well...

tire pressure
lug nuts tight
shocks (if they are Ford and have more than 25k miles, they are probably about done)
LCA bushings
sway bar connections (and bushings in the front)

 

My shocks are blown, I know that for a fact. I am not sure if they're factory, but wouldn't suprise me if they are. Since I got the car I've put on over 20-30k miles on it.

My brothers landlord knew as soon as he lifted my car on the lift that it was the Upper Control Arms (which my mechanic and him call it the other name) bushings. I had my mechanic not to long ago to check over it to make sure. He checked multiple other things to make sure there wasn't anything else that I needed to replace/fix. Come to find out the Upper Control arms look like someone tried to pry them open, they're completely wrecked and uncommon he says.

He told me to just get used ones and if needed replace the bushings. I didn't know until my other thread that they were called Upper Control Arms.