I have installed a few of these suspension systems.They are very well engineered.They can be welded in.But they don't need to be fully welded.If you welded it in make sure you grind all of the galv. coating off the frame rail's.This will help you get the best qualtiy welds.Ride Tech componet's are top notch,& fit right the 1st. time.My son Kevin noticed and improvement in handling of his 69 camaro after we install Ride Tech's 4-bar and Triple ajustable coil over's.
(Ride Tech Dealer)