I have a 79' C20 and was wanting to swap my 3/4 ton springs for some 1/2 ton springs. I know this will drop it a bit in the front, but how much? I have 16.5 wheels with basic A/T tires. And was wondering if my tires will rub on the fenders when turning? Also i was wanting to make sure that these springs can be swapped, the deminions and stuff. Thankyou