When going speeds between 60-75 mph my truck was vibrating, so I went under the truck to check to see if my drive line and U joint looked OK. Turns out my drive line is loose and I have a dent in it so no high speed long trips until this is taken care of. I'd like to get some suggestions on what kind of drive line and U joints I should look into. I'm in a 2004 Ranger Edge V6 4.0L

 

You should have 1 piece drive line in 2004

Regular cab or extended cab have different length drive shafts, also 2WD or 4x4 matters
Manual or automatic as well, except for 4x4

Wrecking yard should have one, 1998 and up will fit

I have had good luck with Spicer brand u-joints

 

I assume by "driveline" you mean "driveshaft", correct? IF so, what exactly is loose? If you shake it, what part moves? How big is the dent? Is there a drive-line specialty shop in your area? If so, drop your driveshaft off and let them work it over.