I just switched out my stock 15 Iroc '90 Rims to the stock 16s and while the front looks fine, the rear seems to be a little lower then cars I've seen that came with 16s stock. To keep the factory height in the wheel wells, do you also need to switch out the springs when upgrading from 15s to 16s? This is a stock resto.

-Thanks

 

Probably your imagination.You dont need to swap springs, especially the rear.Spring rates vary for the front, but not the rear springs.Height is the same, but irocs are .5in shorther.