I am loking to install the rear QA-1 shock/coil over combo for the rear on my 83 Z. How are these working if you are using them and what application?

I have a pair (not coil overs), they lasted about 3k miles before they started leaking.

Well that's not good! Were you able to send them back and get them repaired? I have a set of the double adjustable units on my 9 sec radial tire malibu and they seem to work well, it is just driven on the track though. I plan on driving the camaro some but primarliy race it.

Nope, QA1 referred me to places to rebuild them... at my own cost. I was at somewhere between 2 and 3 years and their warranty is 1. Car is mostly street driven and a few passes at the track. Besides a couple people here and there, havent heard much so maybe I was one of the lucky ones but QA1 wasnt helpful about it at all.