Howdy,
I am wanting to do the 2500 coil onto my 1500 swap. I don't have much history on my truck though. I want to make sure that I really have a 1500 coil spring and not a 2500 coil spring already on the truck. Could someone with a stock 99ish 1500 (not sport) measure the height of their coil spring?

(Pics added for reference)
(Edit: That is my truck in the pics)

 

well I just measured mine and they are the same hieght as yours....I was under the impression I had the larger springs already from the po but maybe not..... I may just have a 4" body lift...hmm....opens up some possibilities for some cheap extra inches...

 

Could you take a pic of one of your mounts? Just to be sure. IIRC, the front or the bed mounts are easiest to see.