I just added light duty F 250 rear springs to my truck and I need to put new shocks on I think it added 3 '' but i'm not sure does any body know

 

You should also put the coil spring in as well. Their will be a minor height difference.

 

i put in 2 inch larger lift blocks in my 98 f150 to add hight, then rough country 2-5 inch lift load leveling shocks. its a little different setup than you have but it should work for you to.

 

Um the height increase from the LD F-250 springs should have been minimal.....no where near 3 inches. I'm not sure what your question is....are you asking which shocks you need? If so, you only need stock length shocks. If you were to add longer shocks, they would bottom out when the rear suspension compresses.