im having an extreme wobble in my back right at 70 mph. someone help me figure out if its suspension wheel balance or etc...

 

Loose lugs?

 

nope, my car drives and feels prefectly number but if its under a load or even in neutral between say 69 and 73mph just hardcor vibration and wobble

 

stock or aftermarket wheels?

 

Tire out of balance
Wheel not centered on hub
Tire worn, cupped
Tire tread separation

 

its possible that you're u-joint on your driveshaft may be beginning to seize up. check it out, ive had similar issues and that's been the problem.

 

stock rims, thanks for the info gonna be doin some research

 

running spacers?

 

Year? Mileage?

Lowered? That would cause increased wear on the rear axle CV joints.

 

Surprised that you can pinpoint the problem to rear passenger side. Now you now exactly where to go for a solution.

 

hub assembly?

 

Thinking about it more, 70mph sounds like a tire out of balance or something else wrong with the tire.

I had a Mustang once that swayed from side to side in the rear at certain speeds because of a failure of the belt under the tread, according to the tire dealer. It was replaced under warranty, and the problem went away. Not long after that, the car went away, too.

 

Specific MPH range usually suggests balance. I'd go there first.

 

Cracked rim?

 

Bent Wheel is my guess.

 

Tire/wheel balence, or damaged tire.

I have had plenty of beaters with cheap tires to know.

 

make sure to check your wheel bearings too