94-01 Dodge Ram 1500 5.9L V8 4x4 Shaking

Hello I have a 1996 Dodge Ram 1500 5.9L V8 4x4
Automatic transmission sport model

I have a severe shaking at 1500 rpm last gear and a slight shaking at idle doesn't shake when I'm off the gas barely shake when I kick it into higher revs but I than hear piston slap.

I replaced the spark plugs and I have brand new U-joints

Last night I checked all the plug wires and they are all getting spark
But my exhaust is skipping like I'm not firing in a couple cylinders

I checked the rear transmission mount (I'm replacing it)
And the Engine mounts look ok but I'll check again today

I've read a ton of forums and they all have different answers so I'm really trying to figure out what is wrong before I spend a bunch of money replacing things that won't fix it!

I've read that it can be my tranny, TC, Harmonic Balancer, Steering Stabilizer, pinions, Tie rods, Steering(over all), IAC, Fuel System, IgnitionSystem, and much more please help!!!

Thank You, Donovan R. L. Winchell

Here's the fix to the problem I was having!
http://dodgeram.info/tsb/1998/18-48-98/18-48-98-v8.htm