if its bent you need to see if you can get upgraded keys.
back the bolt out make sure you suport the key if you are tryinmg to change them. be very carefull they have a butt load of tension. back the bolt out remove the perch and lower the key. then you just slid the bar out remove the key install the new key. then the bar now here is the dangerous part. find a way to jack up on the key to clear the way for the perch. keep your fingers clear. remove jacking devise and install bolt. messure the truck after EVERY turn of the bolt. its important not to over tighten it give shitty ride quality and can damage the torsion bar. hope this helped