On my 79 f150, it has a block lift in the rear and longer coils in the front. That is the way she came when I bought her. In time I am going to put on a suspension lift. I am thinking about a 4" lift. But the question is,how do I determine the current lift that is on her now so I could figure out if four inches of lift is what I want? I'm thinking you just measure the blocks?

 

Without knowing what kind of springs or measuring the spring without tension, it really is just a guess. I went through this and found out it already had 2" springs up front, so I had no difference when I put new springs in height wise, but rides a whole lot better at least.

 

If the truck just has stock blocks in the rear, it probably doesn't have any lift back there. However, the front could be different as previously posted. The rule of thumb is that the rear will be lifted one-half of whatever is in front. For example, a 4-inch lift will use 4-inch taller coils with about 2.25-inch blocks...

To eliminate variations in tire size, vertically measure the distance from the axle centerline to the fender lip. Do this front and rear and post your results. Then compare your measurements with stock and lifted 4x4s using the same methodology.

 

Thanks! I'll have to get those measurements next week when I'm off.