GM changed the body style with the 73 model and while I loved mine, it was a real POS. The tops cracked in the rear along a seam due to the body flex. This wasn't limited to a few, literally every one of them cracked, even if you didn't go off-road, although off roading certainly exacerbated the problem. I had mine fixed 5 times. The last fix kind of worked, it that it limited the crack to a joint that at least didn't spread or leak. To "fix" the top issue, GM redesigned the truck making the the cab portion metal and permanent with just the back half removable. This change happened with the 75 model, IIRC.
Then there was the sheet metal. GM bought the steel from Japan and it literally started rusting within a year. With poor drain designs that quickly clogged with leaves and debris, fenders were rusting through within 3 years, whether the truck was rustproofed or not. Within 5 years of introduction, you couldn't find a 73 model in the "salt belt" that wasn't a rust bucket.
Lastly was the under powered V8. The muscle car era was definitely over and the Blazer 350 had something like 165 hp rating, making it a real dog.
Still, the body lines were iconic, the short wheel base helped with weight distribution, the removable top made for great good weather driving and the tried and true straight front axle made for easy lifting and gear swaps. Plus the engine bay had plenty of room to hold any engine you wanted to drop in with ease. Increasing tire size was relatively easy and removing the rear seat (4 bolts) gave reasonable storage area.
Shots of mine:
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