Had an '85 Z-28. While it could handle any curve in the road, it was a POS.
Engine problems, tranny problems, rear end, body, you name it.
I traded it in on a Chevy 4x4 in 89. That one qualified for lemon of the year. I have a complete record of shop time, and wasted repairs. The regional rep from GM and I got to know each other on a 1st name basis.
At one point, he finally asked me 'what it would take, short of going to court'.
I told him, "replace the entire drive train". They did.
Without going into details, all I can say is the technicians at GM are less than worthless.