I have a 1994 Chevy C1500 extended cab with a 350. I am planning on getting some Coy C5 wheels to go under it with 20x10 in the back and 20x8.5 up front. I was thinking a 4/6 drop would be perfect for it but what do ya'll think? It that too low?

 

Maybe.

Depends on if the tires will rub everywhere with those rims. You'll want to figure out offset and back spacing to see if they will clear the fenders.

 

I have the backspacing figured out and can roll the fenders to combat rubbing.