2/4 drop question

[SidsChopShop]

I am planning a 2" front 4" rear drop on my short bed 66, I will be running 225/75/15 on 8" smoothies.

I have been looking at kits from CPP and Early Classic. The kits are similar with the adjustable trac bar and springs but 1 kit comes with shock relocators. Both mention what is needed for more than 6" of drop in rear.

My question is for those who have done this drop, what is really needed for a 4" drop in the rear? Just a new trac bar and springs, or do i need the shock relocators?

Thanks in advance