Squirrelly rear end in rain - new tires, new wheel bearing

[joshua6060]

Ok guys, I'm a little lost at what to do at this point, I was driving on the interstate yesterday and hit some rain, and suddenly my rear end gets a little loose, never lost control or anything but I could feel the rear end kinda moving on me a little in the rain, I just had a new wheel bearing put on the passenger side, and I have two new Sumatuma HRTZ II's on the rear end with less than 1,000 miles on them. I have posted about this problem before,

http://986forum.com/forums/showthread.php?t=15442&highlight=tires+wheel+bearing

Do you think I need to have the rear wheels aligned? The car feels perfectly fine when its dry, The streets are pretty bad here in New Orleans so its reasonable that I could need a new alignment, but I just got the car back from the shop about 3 weeks ago!!!!!!!!

Alignment is recommended when installing new rubber. Are the tires the same front and rear?

[renzop]

What size front and rear tires do you have ? Incorrect size stagger can cause odd behaviors. What brand are the front tires? I would look at rear toe. Good luck!

[joshua6060]

Michelins on the front, couldn't afford to match the tires because I knew I was going to take a hit on regular maintenance and a few repairs over the last 2 months now pushing $4,500 all together....

I was thinking that it was an alignment problem on the rear end also.....

[Topless]

Sounds like a pretty big tire mismatch. Just don't lift your right foot unless you are going in a straight line.

[Quickurt]

Likewise, big tire mismatch. I'm not big on mixing brands or even styles of the same brand.
It won't show in the dry unless you're really at the edge, but in the rain, every little imbalance is magnifyed a hundred times......