I HAVE A 2WD 99 3500 AND I WANT TO LEVEL IT AND I HAVE FOUND A 1 1/2'' BLOCK AND A 2 1/2'' BLOCK WHICH ONE DO I NEED TO LEVEL MY TRUCK

 

1 1/2"

2 1/2" is too much, makes it sit really high in the front

 

2 1/2 is too much, would require different swing arms, to get the wheels lined up correctly. 1 1/2" is just about right(not quite level). I put extra 450# in the bed of my truck to ease the ride, and it levels it perfect.