What year of F150 are you thinking?

The TJ springs are a smaller diameter than the stock Sportage springs, so the coil spacers are also smaller in diameter. They will fit, but the stock springs will not fit into the spacers and will pop out. If you have the TJ springs installed already and try to fit spacers too, you will run out of room on your breaklines and other things. Not a good idea.

Logansportage <img src="/forums/images/graemlins/patriot.gif" alt="" />

White 1998 4 door KIA Sportage 4x4 w/Eibach 2.5 spring lift and TJ rear coils, 4crawler 1.5 body lift, Monroe Sensa.trac shocks, Bosch 4+ plugs, Eaton LSD, 31x10.5x15 BFG KM tires, 2.5 cat back exhaust w/SpinTech muffler