Dodge72
Odd one out
So recently I changed a lot underneath my Dart. New front disc brakes (and with that, new upper control arms and bearings and the like), a 8 1/4 open diff with 3.23 gears, and with that I changed to BBP with aftermarket Rallyes and new tires. Got the driveshaft shortened and balanced, with new U-Joints and U-Bolts. Got a good alignment afterwards to properly fit the bigger tires. Drives straight by itself, little if any wandering. If I get on the highway and past 65 MPH, I start hearing in the rear this 'whomp whomp whomp' sound and feel a vibration. It's a very droning sound and gets worse really fast if I past 70. If I go 75+, the noise gets so damn loud and the vibrations make the entire car shake! Scares the crap outta me, so I really try to stay put at 60 MPH, because even the noise at 65 is irritating. I've tried looking around and people are saying lots of things; axle bearings, wheel bearing, tire rotation needed, tires balanced, ect. ect. My car is absolutely fine at anything under 60 MPH; no noise, no vibration, just a really smooth ride. I haven't been able to crawl under there (it's rained inches and inches within the last few weeks), but what should I check for in the upcoming drier days?