My 66 Dart has come along way from being stock with 6 cyl. 13 inch tires on a 7 1/4 rearend.It now has a 410/904 built for racing,also a shortened 8 3/4 with spool and Strange axels.Zandful,have you looked at your 40yr old LCA bushings lately?I bet they,re mush and hanging out.When I got my 66 Dart,it still had all the factory frontend parts,brake lines and such.LOL.I,m upgrading to handle the added weight,torque and HP that is being thrown at the whole car in a split second.I,d hate to launch(wheels up)and come down to a broken part.I,d surely wreck the car and maybe even get hurt.This is why I,m doing upgrades to my RACE car.:-D