I was wondering what the specs are for a lift block for the back of a 2008 Dodge Ram 2500. Just like the hole size and such.

 

Has anyone put 2" blocks on top of the factory 1.25 block? I know it's not recomended but I need to lift the rear 2".

 

Don't ever ever ever stack lift blocks. They'll spit out and that gets really gnarly.
You'll just have to buy a lift block or start stacking leaf springs on top of the stock lift block. Either that or I'm sure you could get just rear springs from a 4" lift, they're typically a 2" lift rear 4" front.

 

You can go to Autozone and buy 3" aluminum block sets for $30. Have you considered lift shackles also to go in combination with your current block setup? Ive got 3" blocks and 3" shackles