Well! This is not going to be the quick job I thought it might be.
Rear spring removal is supposed to be a quick job of removing 2 nuts, 1 bolt+nut, thus freeing one end of the control link (toe adjustment) from the axle carrier/hub assembly, and then the axle/carrier hub assembly from the control arm, which you then simply push down and the spring falls out! Easy as pie!
HA!
The sleeve in the bushing of the control link is
siezed to the stud on the hub assembly. I'll destroy the bushing if I smash it or pry on it any more than I have. (Or heat it.)
Also well and truly
siezed is the bolt holding the axle carrier/hub assembly to the control arm. No amount of penetrating oil or hitting it with a mini-sledge is going to free it. And I don't have a torch. And I just broke the adaptor for my little impact driver!
This Firefly has only been winter driven a handful of years, but apparently it was exposed to enough salty mess to convincingly lock these bits together.
* I actually went back to GMF to see if I misread the "10 minutes per" comment. Guess where the poster lives? California! Haha, of course. Rust free California.