Floor Jack for truck lifted 3" - Jack Height??

If you lift under the control arm, it'll go plenty high enough. Or what I do at home is lift under the front skid plate, with a 4x4 block of wood in between the jack and skid.

 

Yeah but I want to lift from the forward crossmember, and have full droop

 

Then use the second option

 

this an awesome jack!
http://www.napaonline.com/Catalog/Result.aspx?Ntt%3d791-6420%26Ntk%3dKeyword%26Nty%3d1%26Dn%3d0%26D%3d791-6420%26Dk%3d1%26Dp%3d3%26N%3d0

 

Yes, There is a jack point in the center of the skid plates on the front crossmember. And I dont want to use a piece of wood, I just wanted to know if anyone knew how high the jack needs to be able to go at a minimum to lift from that point and have the front wheels off the ground.

 

On my DCSB, 885's+1/2"Spacer (3" Total Lift) and 285's I'm measuring 13.5" from the ground to the bump on the Crossmember.