Loud Vibration from 1986 pickup
 

Hello guys, hopefully I'm in the right form. While I'm driving I've been getting a loud vibration when accelerating over 1500 rpm and then once I let off the gas the rattle is there until it drops below 1500rpm. I'm thinking it's the u-joint but I don't have much experience. Thanks for any help!

I'd say ujoint or a tire out of balance, perhaps even carrier bearing if its an xcab. Test ujoing by grabbing the driveline and try to wiggle the joint by hand. You can also use a screwdriver wedged inside the joint to see if you can observe some play. There's youtube videos of how to check them too.

Thanks for the help got her all figured out!

And it was.....

There's a bit of play in the ujoint but most of the noise is coming from the exhaust manifold... there are 3 screws holding it on, and the one at the back (couldn't see it) was gone so its just a rattling nightmare. Lesson learned to check the easy stuff first. Thanks for the help