Driveline shake at 1500rpm

I have noticed others post similar issues

Right at 1500 rpm the driveline starts to shake. All most feels like a driveshaft or axle wrap. It doesn't matter what speed the truck is going just the engine rpm.

Any help from my Toyota brothers would be appreciated.

 

Engine speed related makes me think engine mounts, cab mounts or radiator mounts.

 

You could also be getting a misfire on a cylinder that makes it rough and shaky at that RPM.

 

I wouldn't be surprised if the truck has a few of those issues. It is very pronounced and feels like it's coming from the back half of the truck. I did have a broken engine mount but had it repaired a few years ago.
I'll run this buy the shop I'm working with. I did have them check but I believe they didn't have a clue. Even said it was my tires. No way that is the cause. It is much worse at slow speed under acceleration load but only does it at 1500 as soon as it goes to 2000rpm it stops.

 

I did have the trucks computer plugged in for a evaluation. Only thing that came up was the catalytic converters are on their way out.