Originally Posted by JAMMINKRAZY

12 degree spindle carriers have 12 degrees of caster. 10 degree carriers have 10 degrees of caster. More caster will decrease off power steering entering a corner, and increase on power steering mid corner and exit. Less caster will increase off power steering entering a corner, and decrease on power steering mid and exit. The 12 degree carriers will smooth out the off power turn in and provide a bit more on power steering. 10 degree carriers(Stock caster) will make the steering more responsive and increase off power turn in.