Rear end seems loose "light"?

Ok so i was driving up the mountain to work today. I noticed when i came around a corner, the rear end felt "lighter" than usual. i pulled over and checked everything in the rear, nothing looks bent, or different than when i bought the truck. Shocks looks good from what i can tell and all leafs look ok too. I did get some new tires but i dont know if it would be this bad. I started to go again got to about 35-40 mph and turned the wheel back and fourth multiple times and it felt like the rear end was gonna slide out from under me. Not sure why this was happening. If i go around a corner at 45 its fine, doesnt move or slide and maintains lanes. but just seems weird. I never tried back and fourth before so i dont know if its always done it or since i got tires.

Also my two "uneven" rims are on the rear. The shop i had put them on balanced and we found they were both rims were bent a little so we balanced them and put them on rear. dont know if with rims balanced with that much weight is the reason or what?

Any help would be much appreciated.

 

What tires are you running now? What psi?

 

General Grabbers AT2 45ish PSI

 

I think 45psi is a little on the high side with no load. Try running at 35psi.

 

Ill try and air them down tomorrow and see how that works, Thanks

 

Google chalk line test for psi.

Also there's gunna be some tread block squirm.

A couple hundred miles should also wear off the release agent too.

Run the rear a little lower than the fronts.... Unless ur carrying a load, the front is holding up more weight. If ur running the front lower than the rear u may feel more understeer due to sidewall flex.

That being said, what load range are the tires?

 

35 psi all around

 

Lowered the PSI and now they feel great. Not much squirm now.. which is deff an improvement. Thank you guys for the help!!

 

I run the same tires that are stock size and I run 36psi. 45 seems high.