some times when i spin the tires the back end shakes real bad like the wheels are bouncing. what could be causing that?

 

Thats called "Wheel hopping"
WHICH IS VERY BAD FOR YOUR CAR.
so Don't do it!
To fix it you can buy a torque arm upgrade.
Which will help force your back wheels down,
and it will help your car be faster too.

 

would i be able to tell a difference in torque?

 

It's not a power mod, but a suspension mod. Lower control arms in the rear will help out with this also.

 

It will help get more power to the wheels though.

 

yea i figured it would not be a power boost but i wondered if i would tell a difference. thanks

 

no... It won't... It will help keep his wheels on the ground...

Deja Vu?

 

u WILL feel it. i felt mine. the difference in how hard it hooks is pretty noticable

 

Also get Moog Solid rubber LCA bushings. Believe me, I was stunned after I got those things in. Cheapest, most worth it mod I've done yet. Shocks help too. Don't get the poly or rod ended aftermarket LCA's, no need for those with a V6. The stamped stockers are more than enough with the moog bushings, you can box them too if you wanted. With my strano bilsteins and moog bushings alone, wheel hop is 100% gone now, stock torque arm. And I'm not friendly to my 315's when I light them up