May need the driveshaft balanced, but start with the u joints. Guessing you don't have a carrier bearing?I've got a weird vibration above 65mph. It smooths out as soon as I let off the gas.
I bought the truck a few months ago and it seemed to come and go. I've had the dealer and Firestone look at it and both of them tell me everything looks good. I replaced the tires as they were miss-matched and I hoped that would fix it but it still does it.
The U-joints appear to be fine by shaking and turning the drive shaft but I'm thinking it's probably worth replacing them, maybe that'll fix the vibration, the truck has 133k miles and they appear to be original.
Which brand do I replace them with? Do I stick with OEM from the dealer or can I get the Spicer from O'Reilly's/Amazon?
Stick with OEM everything.