i just got the rcx 5" lift with 4" rear blocks.
my truck now has a factory 2" block.
do i stack the 4" block ontop of the 4" rcx block. i was told that i no longer use the 2" factory block. if i do that i will only be 2" higher in the rear. how do i do this. Thanks Mike

 

take out the 2" stock block and replace with the 4" block...

 

then i will only be lifting the truck 2" in the rear. will this not make it sit nose up.

 

If you want to part with the 2" block I would purchase it off of you. Given that it is a 04-08 model?

 

no you dont want to stack your rear blocks. remove the stock one and replace it. what amount of lift were you wanting to get out back?

 

yeah, definitely don't stack blocks. Either get a taller block or get an "AAL" in addition to the 4" block your lift came with.