Short shocks will cause that bouncing.. drop the axle housing with the shocks off and see if you have at least 1" that the shock is longer.. quality shocks also help
Thanks Man, I will do that to check if I've this 1".
About the shocks I'm looking for Vikings. Looks like excellent quality.
'77 Brazilian Dodge Charger R/T - Street Car Footbrake, Pump Gas, SB Mopar 360" N/A 3300lbs, Leaf Spring + Assassin Bars Best 1/8 mile ET 1.50 60' / 4.31 330' / 6.73@102.54mph