I'm sorry you're having trouble with the mounts. "Motor mounts" have been a frequent topic of discussion on here since 1998, when I joined. Comes up all the time.
The original Chevrolet (not aftermarket) mounts were good for 10-15 years in stock street driven trucks. Yes they were $100 each in 2000, but they were durable. Those haven't been available for at least 15 years, and the current Chineesium "Atlas" ($20 each, what does one expect?) lasted less than a week in that Ty.
I never liked the idea of solid mounts because of the increase in Noise, Vibration, Harshness (NVH), but everyone said "no problem. I don't feel a thing." Bull Shit, when I finally had no choice but to install the JSMs in that truck I immediately noticed a huge increase in NVH, particularly at idle, in gear. I got into the habit of popping it into neutral while waiting at a light.
I feel that the solid mounts fail from metal fatigue BECAUSE they are "solid". There is no allowance for vibration and harmonics absorption in the rubber of the mount. Everything being solidly bolted together, and not in stress-free alignment either, the metal is going to crack much quicker. I've never seen a stock rubber mount's steel components fracture from fatigue. The fact that everything is all forced together, solidly, is why they break so quickly. Make them out of 1/4" plate, they will still crack.
I like the JTR kit that Phil linked, and that's the one I was referring to in our phone conversation. Changing the frame pads is a royal PITA. Because I work smarter, not harder, I remove the lower A-arms for access. That truck's suspension was all apart in 1998, and the knuckles were off for the brakes in 2017. It will come apart. If you want to do it here on my hoist let me know.
