If you look at the question asked by someone on Stage 3's page about an 1 1/2" rear block, stage 3 says that the 4x4's already have an 1 1/2" stock, so to lift it another 1 1/2" the guy would have to use a 3" block.

So that would mean that the 4x4's are about 1 1/2" taller, not taking any difference in tire size into account.

http://www.stage3motorsports.com/66-...Block-Kit.html

 

Depends on the situation. For road driving then that extra 1.4" is doing anything except maybe allow more undercarriage wind to cause a lower MPG but when you're off roading that same 1.4" extra of clearance could me the difference between you clearing a fallen log or some ledge. Your approach and departure angles are increased. Less chance of becoming high centered.

Is 1.4" inches going to make that much of a difference? Probably not noticeably.

 

I think there's a difference too between towing packages' heights. I added a 2" level, and can't believe the difference in the stance, much higher.