Howdy y'all, been experiencing some issues with my 93 F150 5.8 with 150k on it. Recently made a trip from Tallahassee to Destin and about half way there cruising at 60, I noticed a vibration that got worse as the trip went on. Since, the vibration has gotten worse, or so it seems, and it can be felt around 30 and gets more violent as the MPH goes up. I did some research and read some posts indicating it could be my torque converter? Or maybe my drive shaft? The tranny was rebuilt about a month or so ago and shift fine, fluid is fine. I have noticed some fluid leaking from the transfer case/ driveshaft area (I believe its called the yoke?) I also recently installed a tranny temp sensor, and a few radiator with hoses. Tranny tempt always stays between 140-180

Theres also an extremely squeaky pulley which I think is just the idler. Tires are balanced and the axles are good. I have a brand new SAS on the truck so i know its not suspension related.

Ive also have an air/fuel gauge in stalled and it bounces back and forth from lean to rich... Fuel pressure regulator?

Could have the truck run lean/rich be causing the motor to vibrate? Or would this be purely drivetrain?

Thanks for the help!!!