poly binds especialy in the front leaf spring eye imagine the arc that one rear wheel has to take as it goes over a bump or a steep driveway, now the leaf spring is flat but in order to follow the arc the leaf spring has to follow the angle that the solid rear axle makes in essence the rear wheel will camber in relation to the chassis, the forward half of the leaf spring in fact acts as a lower control arm and the bushing is the pivot point and if a solid bushing is installed in the front eye of the leaf this cambering will not happen and cause the spring to try and twist adding to the spring rate in an inconsistent way.
Poly bushings should be considered as solid bushings.
As for front control arm bushings being replaced with poly bushings the main problem there is the inability to grease them on a regular bassis as should solid bushings.
NOW gt182 last post back to you , this forum is read by thousands and the info you put out should be correct, BTW I own a 79 WS6 Formula 4 speed (one of 346 made)
Obviously you don't know the car like the back of your hand
I believe you would know that a 79 4 wheel disc Firebird is reffered to as a WS6 equiped car because the rear end could have been transplanted!
So now do some reaserch before trying to prove someone else to be posting missinformation, thank you have a good day
