I have a 1984 c-10 swb that has a 5-7 drop using spindles, coils, flip kit, shackles and a frame notch. When it comes to parts.....pick up a street trucks magazine and they have all sorts of suppliers. Western chassis, Bell tech, air slamit.com you can do a package deal and save some cash in the long run (most products are cast in China, no matter what brand you choose). Some have cut a coil off the front spring, but depending on how worn your coils are, you may lower the front more than you desire. Everyone has their own opinions about what brand is better than the other...it comes down to personal opinion. What size wheels are you planning on using once dropped? I ended up ditching the 15" steel rally wheels and went with 20". If you end up using 2" drop spindles, the back spacing on the stock 15" rally wheels will rub on the lower stock a-arms, unless you notch the arms or use a larger diameter wheel. Be sure to replace the upper and lower ball joints since you will have the front end torn apart (it's easier to do everything at once).
Be sure to post pics of before and after....
Someone here may be able to give you info on how to determine the different spindles. When I picked up my square it had already been lowered with spindles and coils. I would think that the spindles needed would be specified by the year of the truck.
