* Rear Suspension Components: The basic suspension layout is similar, but there might be subtle differences in mounting points or bushing sizes. You might need to swap some parts (e.g., control arms, shocks) or modify existing ones to make it work.
* Rear Axle Assembly (Differential): This is more problematic. While the bolt patterns might be the same, the gear ratios could differ. Using a different gear ratio could affect speedometer accuracy and vehicle performance. The axle shafts themselves might also have different lengths.
In short: It's *unlikely* to be a direct bolt-on swap. You'll likely encounter issues requiring modifications or component swaps. It's best to carefully compare part numbers and dimensions to ensure compatibility before attempting the installation. A professional mechanic specializing in older GM vehicles would be the best resource for determining feasibility.