re: question about a pro street frame
Heim joints are great for the racetrack where the suspension system gets frequent maintenance. If the vehicle's primary use is the street, heim joints dont live long in that environment. Dirt and especially moisture will quickly turn them into immoveable objects. That being said, teflon lined heims are a step in the right direction, and even installing seals that are available do help increase the life of the joints, but in the end a more maintenance free solution that is plenty strong is just to go with urethane bar ends. Heim joints also transfer alot of vibration and road noise to the chassis.