my bro-in law has a 91 l98 z and we are installing 1.6 rr and want to upgrade the springs at the same time. Will the lt4 springs drop right in or are they to big? if so, what is an affordable drop in replacement? also, what else should we replace? should we replace springs only, or do we need to replace all of the accompanying spring hardware?

 

If I am not mistaken, the stock springs are 1.25" and the LT4's are 1.32" so you would have to have the spring seats enlargened. I don't know what springs you should get, it all depends on how much lift you are looking at with the 1.6 rockers.